What if a provider’s polished security report leaves the most important question unanswered: who is responsible when a control crosses your business, the BaaS platform, and another partner? A BaaS platform security audit checklist should test more than reassuring claims. It should establish whether the evidence is current, relevant to the services you’ll use, and clear about who owns each control.

When assessing a provider, look for evidence you can validate, not promises you have to take on trust. Security gaps can affect customer data, payment operations, and launch plans, especially when responsibilities are divided across several parties.

This guide gives you a repeatable way to define scope, request and examine evidence, map shared responsibilities, and identify gaps that need follow-up before you commit. It also explains how to compare providers against the services you plan to use, from accounts and payments to foreign exchange, cards, and API integration. The aim is a defensible decision based on evidence and fit, not broad assurances. Written by Alexander Legoshin, this 2026 due diligence guide helps you ask sharper questions and make a more informed launch decision.

Key Takeaways

• Use a BaaS platform security audit checklist to compare providers against the same services, control areas, and evidence criteria.
• Map data flows and service boundaries first, then confirm who operates, configures, monitors, and supports each component.
• For every piece of evidence, record its owner, date, scope, limitations, and any follow-up needed.
• Weigh security evidence alongside integration needs and customer journeys. Treat unresolved, high-impact questions as part of the provider decision.
• Use a consistent process to turn due diligence findings into a defensible provider choice.

Table of Contents

• Why a BaaS Platform Security Audit Belongs Before Provider Selection
• Map BaaS Security Responsibilities Across Your Platform and Provider
• Compare BaaS Security Controls: APIs, Access, Data, and Operations
• Run the BaaS Security Audit: A Practical Evidence Checklist
• Choose a BaaS Platform That Fits Your Security and Operating Needs

Why a BaaS Platform Security Audit Belongs Before Provider Selection

Choosing a banking infrastructure provider is also a decision about how customer journeys, data, and operational responsibilities will connect. A BaaS platform security audit checklist makes that decision more disciplined. It helps you examine the services you plan to use, the evidence behind a provider’s claims, and the boundaries between your business and its partners before you commit.

Banking as a Service (BaaS) describes a model in which banking services are made available through another business’s platform. For your assessment, the label matters less than the actual arrangement. Will your launch involve branded accounts, payments, corporate cards, foreign exchange, or banking API integration? Each service can involve different systems, data flows, user journeys, and parties to assess. A generic review may miss risks specific to how you intend to operate.

What does a BaaS platform security audit assess?

A BaaS security audit is a structured review of the controls, evidence, responsibilities, and service fit relevant to the banking services your business plans to use. Start with the customer journey you intend to support, then trace the systems and data involved. For each claimed control, note whether it is documented, what evidence supports it, and whether that evidence applies to your proposed service. Flag material that is missing, out of date, or outside the stated scope.

For example, a provider’s materials may describe a control in general terms without showing whether it applies to the API connection or payment flow your product will rely on. Record that limitation and ask for clarification or service-specific evidence. If you’re considering Gemba, assess it against your planned services using the same evidence-led process. The company’s capabilities alone are not proof of specific security controls.

Why provider status alone is not a security assessment

Regulatory status, independent assurance, and control evidence answer different questions. Status can help clarify an organisation’s role and permissions. An independent report can describe an assessor’s work within a defined scope. Control evidence can show how a particular practice is documented or operated. None should be treated as a guarantee of security.

Verify the provider’s relevant role and permissions for the services you intend to offer, including the roles of any partner institutions. Then check the scope, date, and limitations of any assurance materials. Ask how they relate to your planned setup and follow up on anything the materials do not cover. This checklist supports commercial evaluation. It doesn’t replace legal, regulatory, or technical advice. The process can help make provider comparisons more transparent and informed.

Map BaaS Security Responsibilities Across Your Platform and Provider

A provider’s controls matter, but so does the boundary between those controls and your own. Before sending audit questions, map how the services you plan to launch connect: your application, BaaS APIs, provider-operated services, and any external dependencies. The Financial Services Sector critical infrastructure designation provides context for why disruption can have consequences beyond a single technical component.

How to build a BaaS shared-responsibility map

List each in-scope system and service, then document who operates, configures, monitors, and supports it. Don’t infer ownership from a contract label or product description. Ask the provider and relevant partners to confirm it. For each activity, capture the named owner, evidence source, escalation route, and review cadence. If ownership is unclear, record it as an open due diligence item.

• Your application: Record who manages its access settings, integrations, and user-facing processes.
• BaaS services and APIs: Confirm who maintains and monitors each component, and who investigates issues affecting it.
• External dependencies: Where applicable, identify banking partners, processors, cloud services, and other subcontractors. Record the provider’s stated role in overseeing or coordinating them.

Connect each responsibility to a customer-impact scenario. If credentials are misused, who can restrict access and investigate? If a payment service is disrupted, who identifies the affected flow and tells your team? If data is exposed, who leads the response and supplies relevant information? The answers should be specific enough to guide an operational decision, not just name an organisation.

Which data and service flows need closer review?

Trace the flows relevant to your planned use case. For accounts, payments, cards, or foreign exchange, mark where identity details, transaction instructions, credentials, and other sensitive information enter, move between systems, and leave the platform. Show which party handles each step, including hand-offs to external providers.

For KYC and AML processes, clarify which activities your business performs and which are handled by the provider or another partner. Compare those stated responsibilities with the actual customer journey, then follow up on any gap between the two. This overview of KYC and AML compliance management can help frame that discussion.

If Gemba is among the providers you’re assessing, map its proposed services and partner dependencies against the same questions, then validate each responsibility and evidence item directly. Explore Gemba’s banking infrastructure as a potential fit, without treating service descriptions as proof of particular security controls.

Compare BaaS Security Controls: APIs, Access, Data, and Operations

Consistent comparison depends on asking each provider the same questions about the same services. Use your planned scope, evidence dates, and applicability criteria as the baseline. A report covering one service or environment may not establish how controls apply to the API integration, payment flow, or card service you intend to use.

Your BaaS platform security audit checklist should distinguish between a control description, evidence that supports it, and any limits on what that evidence covers. Request relevant policies, assurance reports, and control descriptions under appropriate confidentiality arrangements. Check the report period, services and systems in scope, exceptions, remediation status, and whether relevant subcontractors are included. Treat claims about encryption, logging, monitoring, vulnerability management, incident response, resilience, change management, and third-party oversight as questions to validate, not assumptions.

What API and access-control evidence should buyers request?

For your proposed integration, ask how API credentials are issued, protected, scoped, rotated, and revoked. Request documentation explaining authentication and authorisation, along with evidence of privileged-access processes, role design, access reviews, and removal of access when it’s no longer needed. OWASP API Security Top 10 can help structure a discussion of API risks, but referencing it doesn’t demonstrate that a provider complies with it.

Compare the answers against your own integration design. For example, ask which party can disable a credential and how your team would learn that access had changed or been withdrawn. Record any unclear owner, missing evidence, or difference between general documentation and your specific service scope as an unresolved gap.

How should data protection and assurance evidence be compared?

Use a shared comparison record so evidence is assessed consistently, rather than relying on provider summaries in different formats. The table below can become part of your BaaS platform security audit checklist.

Control areaBuyer questionEvidence requestedApplicabilityUnresolved gapAPI credentials and accessHow are credentials scoped, reviewed, rotated, and revoked?Relevant process documents and access-review evidenceDoes it cover your planned integration and roles?Record missing proof or unclear ownershipData protection and loggingHow is relevant data handled, and what activity is recorded and monitored?Applicable policies, control descriptions, and assurance materialsDoes the evidence cover your data flows and services?Note scope limits, exceptions, or open questionsOperations and dependenciesHow are incidents, service disruption, changes, and subcontractors addressed?Relevant procedures and evidence of stated oversightAre the relevant services and third parties included?Capture follow-up and evidence owner

If corporate card services are in scope, include PCI DSS considerations in your review and confirm which evidence applies to the card-related services under assessment. A certification or report can inform due diligence, but its scope and limitations matter.

Run the BaaS Security Audit: A Practical Evidence Checklist

Turn your scope and control questions into a repeatable review. This BaaS platform security audit checklist gives each provider the same process, while leaving room to judge findings against your services, customer journeys, and tolerance for unresolved exposure. There’s no universal pass score. A gap’s importance depends on what it could mean for your business and customers.

1. Set the scope. List the services, integrations, systems, and customer journeys you intend to assess. Exclude features you don’t plan to use, and make the boundaries clear.
2. Send consistent questions. Ask every provider about the same control areas and evidence. For each policy, report, or test, ask which systems and services it covers.
3. Collect and qualify evidence. Record the document’s date, scope, limitations, evidence owner, and relevant subcontractor coverage. Ask how incidents are detected, escalated, communicated, and reviewed, and request the documented process. Clarify how the provider communicates material changes to services, subcontractors, or security documentation.
4. Assess findings. Separate missing evidence, unclear scope, control exceptions, and confirmed issues. Consider the service affected, potential customer impact, and whether the remaining exposure is understood.
5. Record the decision. Give each open item an accountable owner, a resolution route, and a decision deadline set by your team. Document whether the issue is resolved, accepted for a stated reason, or prevents selection.

Use an evidence register to make follow-up precise

A concise register prevents a reassuring answer from being mistaken for verified evidence. Capture enough context to compare providers and return to open questions without restarting the review.

ControlResponseSupporting documentOwnerNext actionIncident communicationSummarise the provider’s documented processDocument name, date, scope, and limitationsProvider contact or internal reviewerClarify escalation route or evidence gapService or subcontractor changesRecord how changes are communicatedApplicable policy or process descriptionNamed evidence ownerConfirm relevance to planned services

Turn gaps into decision-ready questions

Before a provider discussion, review your open findings alongside the service model and white-label banking infrastructure considerations. Bring specific questions: which system is outside the report’s scope, who owns the unresolved control, and what evidence would close the gap? This focus makes the conversation useful without treating an explanation as proof.

Use the register to compare providers on evidence quality, applicability, and unresolved issues. Then decide which findings need resolution before selection. To discuss how your planned banking services fit Gemba’s infrastructure, explore Gemba’s banking infrastructure.

Choose a BaaS Platform That Fits Your Security and Operating Needs

A provider decision should reflect more than a report or assurance document. Compare evidence alongside the services you need, the integration work your product requires, the responsibilities your team must carry, and the customer journeys you intend to support. A strong fit means the service scope is clear, evidence is relevant, and ownership is understood.

How should buyers compare providers after the audit?

Use the same comparison criteria for every provider: planned services, evidence coverage and date, stated limitations, responsibility boundaries, and open remediation items. Then explain what each material gap means for your use case. Is the evidence incomplete but obtainable? Does the issue require a mitigation your team can support? Or does the uncertainty make proceeding imprudent?

Keep the rationale concise and accessible to security, product, compliance, and leadership stakeholders. The BaaS platform security audit checklist should help each group see the basis for the decision, not just a score. Note which evidence informed the conclusion, who owns follow-up, and why any unresolved item is acceptable, requires mitigation, or prevents selection. Don’t treat an unresolved, high-impact question as routine paperwork to defer until after signing.

Service fit belongs in the same assessment. If your intended offer includes accounts and treasury workflows, consider how the proposed account structure and currency needs align with your operating model. This guide to multi-currency business account strategy can help you frame those requirements before comparing provider responses.

What should the next provider conversation clarify?

Bring a defined use case to the discussion. Specify whether you’re assessing accounts, payments, corporate cards, foreign exchange, or API integration, and describe the customer journey each service must support. Use your findings register to ask targeted questions about evidence scope, control ownership, partner dependencies, and outstanding gaps. Ask for clarification rather than assuming a particular answer or capability.

Evaluate Gemba, a UK-based fintech providing banking infrastructure for non-banks, against the same criteria you apply to other providers. Its described services may be relevant to your plans, but verify the evidence, permissions, partner roles, and responsibilities applicable to your intended use. Don’t infer security controls from a service description.

A sound choice is one you can explain and operate with confidence. If your scope, evidence requirements, or responsibility questions need discussion, discuss your intended use case with Gemba. Share what you plan to launch and what you need to verify, so the conversation can focus on fit rather than assumptions.

Make Your Provider Decision With Clarity

A sound BaaS decision rests on more than a provider’s assurances. Use the BaaS platform security audit checklist to compare relevant evidence, map responsibilities across your business and its partners, and assess controls against the services and customer journeys you actually plan to support. Keep unresolved, high-impact questions visible rather than leaving them for after selection.

Gemba is a UK-based fintech providing banking infrastructure for non-banks, including accounts, payouts, foreign exchange, and corporate cards. Gemba Finance Ltd was founded in 2020. Before deciding whether it fits your needs, verify its current FCA permissions and review any security-specific evidence relevant to your proposed services. Establish provider fit through clear answers and evidence, not assumptions.

Bring your use case and open due diligence questions into a focused conversation. Discuss your embedded banking requirements with Gemba and explore whether the services and responsibilities align with your plans. With a consistent process and a defensible rationale, you can move forward with greater confidence.

Frequently Asked Questions

What should a BaaS platform security audit checklist include?

A BaaS platform security audit checklist should cover the services you plan to use, relevant systems and data flows, security controls, evidence, and responsibility boundaries. Include questions about API credentials, authentication, privileged access, data handling, incident response, service continuity, change management, and third-party dependencies where relevant. For each response, record its owner, date, scope, limitations, and follow-up. This makes it easier to distinguish documented evidence from claims that still need validation.

How do you audit a Banking as a Service provider?

Audit a Banking as a Service provider by defining your intended services first, then asking consistent questions and collecting evidence relevant to that scope. Map how your application, provider services, and any partners connect, and establish who operates and supports each component. Review evidence for applicability and limitations, log missing or unclear information, and assess each gap against possible business and customer impact. Record the reasoning behind your final decision so stakeholders can understand it.

Does FCA regulation mean a BaaS platform is secure?

No. FCA regulatory status and security assurance address different questions, and neither should be treated as a guarantee that a platform is secure. Verify the relevant legal entity, its current permissions, the activities those permissions cover, and the roles of any partner institutions. Then assess security controls and evidence separately, including the systems and services covered. A provider’s status can inform due diligence, but it doesn’t replace your assessment of security fit.

What security evidence should a BaaS provider share?

Request relevant policies, control descriptions, and independent assurance reports, where available and shareable under suitable confidentiality arrangements. Ask what services, systems, and time periods the materials cover. Note exceptions, limitations, remediation status, and relevant subcontractor scope. For API access, request documentation on credential handling, authentication, authorisation, and access reviews. Evidence should match your proposed use case. If it doesn’t, ask what additional material or clarification can address the gap.

How often should a business review its BaaS provider’s security?

Set a review cadence based on your business’s risk, planned services, and the evidence available rather than assuming one interval fits every provider. Revisit the assessment when your service scope changes, significant provider or subcontractor changes are communicated, new evidence becomes available, or an incident raises questions about existing controls. Agree who will monitor for these triggers and document review dates and outcomes. This keeps due diligence connected to the operating relationship.

Can a BaaS provider’s security audit replace our own assessment?

No. A provider’s audit or assurance report can inform your review, but it may cover a different service scope, period, or set of systems than your planned integration. Your assessment should establish how the provider’s evidence applies to your customer journeys, data flows, and shared responsibilities. Record any coverage gaps and follow up before relying on the material. Provider evidence is an input to your decision, not a substitute for evaluating your own needs.

What is the difference between a BaaS audit and PCI DSS?

A BaaS audit is a buyer-led due diligence assessment of a provider’s relevant controls, evidence, responsibilities, dependencies, and fit for planned services. PCI DSS is a separate security standard relevant to payment card data environments. If card services are in scope, clarify which parties, systems, and activities the available PCI DSS evidence covers, and how that relates to your use case. Don’t assume a BaaS audit proves PCI DSS alignment, or vice versa.

Frequently Asked Questions

What does a BaaS platform security audit assess?

A BaaS security audit is a structured review of the controls, evidence, responsibilities, and service fit relevant to the banking services your business plans to use. Start with the customer journey you intend to support, then trace the systems and data involved. For each claimed control, note whether it is documented, what evidence supports it, and whether that evidence applies to your proposed service. Flag material that is missing, out of date, or outside the stated scope. For example, a provider’s materials may describe a control in general terms without showing whether it applies to the API connection or payment flow your product will rely on. Record that limitation and ask for clarification or service-specific evidence. If you’re considering Gemba, assess it against your planned services using the same evidence-led process. The company’s capabilities alone are not proof of specific security controls.

Which data and service flows need closer review?

Trace the flows relevant to your planned use case. For accounts, payments, cards, or foreign exchange, mark where identity details, transaction instructions, credentials, and other sensitive information enter, move between systems, and leave the platform. Show which party handles each step, including hand-offs to external providers. For KYC and AML processes, clarify which activities your business performs and which are handled by the provider or another partner. Compare those stated responsibilities with the actual customer journey, then follow up on any gap between the two. This overview of KYC and AML compliance management can help frame that discussion. If Gemba is among the providers you’re assessing, map its proposed services and partner dependencies against the same questions, then validate each responsibility and evidence item directly. Explore Gemba’s banking infrastructure as a potential fit, without treating service descriptions as proof of particular security controls. Consistent comparison depends on asking each provider the same questions about the same services. Use your planned scope, evidence dates, and applicability criteria as the baseline. A report covering one service or environment may not establish how controls apply to the API integration, payment flow, or card service you intend to use. Your BaaS platform security audit checklist should distinguish between a control description, evidence that supports it, and any limits on what that evidence covers. Request relevant policies, assurance reports, and control descriptions under appropriate confidentiality arrangements. Check the report period, services and systems in scope, exceptions, remediation status, and whether relevant subcontractors are included. Treat claims about encryption, logging, monitoring, vulnerability management, incident response, resilience, change management, and third-party oversight as questions to validate, not assumptions.

What API and access-control evidence should buyers request?

For your proposed integration, ask how API credentials are issued, protected, scoped, rotated, and revoked. Request documentation explaining authentication and authorisation, along with evidence of privileged-access processes, role design, access reviews, and removal of access when it’s no longer needed. OWASP API Security Top 10 can help structure a discussion of API risks, but referencing it doesn’t demonstrate that a provider complies with it. Compare the answers against your own integration design. For example, ask which party can disable a credential and how your team would learn that access had changed or been withdrawn. Record any unclear owner, missing evidence, or difference between general documentation and your specific service scope as an unresolved gap.

How should data protection and assurance evidence be compared?

Use a shared comparison record so evidence is assessed consistently, rather than relying on provider summaries in different formats. The table below can become part of your BaaS platform security audit checklist. If corporate card services are in scope, include PCI DSS considerations in your review and confirm which evidence applies to the card-related services under assessment. A certification or report can inform due diligence, but its scope and limitations matter. Turn your scope and control questions into a repeatable review. This BaaS platform security audit checklist gives each provider the same process, while leaving room to judge findings against your services, customer journeys, and tolerance for unresolved exposure. There’s no universal pass score. A gap’s importance depends on what it could mean for your business and customers.

How should buyers compare providers after the audit?

Use the same comparison criteria for every provider: planned services, evidence coverage and date, stated limitations, responsibility boundaries, and open remediation items. Then explain what each material gap means for your use case. Is the evidence incomplete but obtainable? Does the issue require a mitigation your team can support? Or does the uncertainty make proceeding imprudent? Keep the rationale concise and accessible to security, product, compliance, and leadership stakeholders. The BaaS platform security audit checklist should help each group see the basis for the decision, not just a score. Note which evidence informed the conclusion, who owns follow-up, and why any unresolved item is acceptable, requires mitigation, or prevents selection. Don’t treat an unresolved, high-impact question as routine paperwork to defer until after signing. Service fit belongs in the same assessment. If your intended offer includes accounts and treasury workflows, consider how the proposed account structure and currency needs align with your operating model. This guide to multi-currency business account strategy can help you frame those requirements before comparing provider responses.

What should the next provider conversation clarify?

Bring a defined use case to the discussion. Specify whether you’re assessing accounts, payments, corporate cards, foreign exchange, or API integration, and describe the customer journey each service must support. Use your findings register to ask targeted questions about evidence scope, control ownership, partner dependencies, and outstanding gaps. Ask for clarification rather than assuming a particular answer or capability. Evaluate Gemba, a UK-based fintech providing banking infrastructure for non-banks, against the same criteria you apply to other providers. Its described services may be relevant to your plans, but verify the evidence, permissions, partner roles, and responsibilities applicable to your intended use. Don’t infer security controls from a service description. A sound choice is one you can explain and operate with confidence. If your scope, evidence requirements, or responsibility questions need discussion, discuss your intended use case with Gemba. Share what you plan to launch and what you need to verify, so the conversation can focus on fit rather than assumptions. A sound BaaS decision rests on more than a provider’s assurances. Use the BaaS platform security audit checklist to compare relevant evidence, map responsibilities across your business and its partners, and assess controls against the services and customer journeys you actually plan to support. Keep unresolved, high-impact questions visible rather than leaving them for after selection. Gemba is a UK-based fintech providing banking infrastructure for non-banks, including accounts, payouts, foreign exchange, and corporate cards. Gemba Finance Ltd was founded in 2020. Before deciding whether it fits your needs, verify its current FCA permissions and review any security-specific evidence relevant to your proposed services. Establish provider fit through clear answers and evidence, not assumptions. Bring your use case and open due diligence questions into a focused conversation. Discuss your embedded banking requirements with Gemba and explore whether the services and responsibilities align with your plans. With a consistent process and a defensible rationale, you can move forward with greater confidence.

What should a BaaS platform security audit checklist include?

A BaaS platform security audit checklist should cover the services you plan to use, relevant systems and data flows, security controls, evidence, and responsibility boundaries. Include questions about API credentials, authentication, privileged access, data handling, incident response, service continuity, change management, and third-party dependencies where relevant. For each response, record its owner, date, scope, limitations, and follow-up. This makes it easier to distinguish documented evidence from claims that still need validation.

How do you audit a Banking as a Service provider?

Audit a Banking as a Service provider by defining your intended services first, then asking consistent questions and collecting evidence relevant to that scope. Map how your application, provider services, and any partners connect, and establish who operates and supports each component. Review evidence for applicability and limitations, log missing or unclear information, and assess each gap against possible business and customer impact. Record the reasoning behind your final decision so stakeholders can understand it.

Does FCA regulation mean a BaaS platform is secure?

No. FCA regulatory status and security assurance address different questions, and neither should be treated as a guarantee that a platform is secure. Verify the relevant legal entity, its current permissions, the activities those permissions cover, and the roles of any partner institutions. Then assess security controls and evidence separately, including the systems and services covered. A provider’s status can inform due diligence, but it doesn’t replace your assessment of security fit.

What security evidence should a BaaS provider share?

Request relevant policies, control descriptions, and independent assurance reports, where available and shareable under suitable confidentiality arrangements. Ask what services, systems, and time periods the materials cover. Note exceptions, limitations, remediation status, and relevant subcontractor scope. For API access, request documentation on credential handling, authentication, authorisation, and access reviews. Evidence should match your proposed use case. If it doesn’t, ask what additional material or clarification can address the gap.

How often should a business review its BaaS provider’s security?

Set a review cadence based on your business’s risk, planned services, and the evidence available rather than assuming one interval fits every provider. Revisit the assessment when your service scope changes, significant provider or subcontractor changes are communicated, new evidence becomes available, or an incident raises questions about existing controls. Agree who will monitor for these triggers and document review dates and outcomes. This keeps due diligence connected to the operating relationship.

Can a BaaS provider’s security audit replace our own assessment?

No. A provider’s audit or assurance report can inform your review, but it may cover a different service scope, period, or set of systems than your planned integration. Your assessment should establish how the provider’s evidence applies to your customer journeys, data flows, and shared responsibilities. Record any coverage gaps and follow up before relying on the material. Provider evidence is an input to your decision, not a substitute for evaluating your own needs.

What is the difference between a BaaS audit and PCI DSS?

A BaaS audit is a buyer-led due diligence assessment of a provider’s relevant controls, evidence, responsibilities, dependencies, and fit for planned services. PCI DSS is a separate security standard relevant to payment card data environments. If card services are in scope, clarify which parties, systems, and activities the available PCI DSS evidence covers, and how that relates to your use case. Don’t assume a BaaS audit proves PCI DSS alignment, or vice versa.