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Security review for a fixed deposit integration should examine the complete operating model, not just an SDK binary or a list of certifications. Customer data, consent, KYC, payment status, issuer communication, reconciliation, and post-booking servicing can cross several systems. A useful assessment therefore identifies the owner, control, evidence, and failure process for each step.
Document what data the fintech, infrastructure provider, issuer, and specialist vendors receive. Separate identity data, KYC evidence, nominee details, payment references, deposit information, and operational logs. For each category, record the purpose, storage location, retention policy, permitted users, and deletion process.
The provider should also explain which party is responsible for customer disclosure, consent capture, issuer eligibility, grievance handling, reconciliation, and incident communication. The white-label FD SDK architecture guide provides a useful ownership model.
Ask how applications and human operators are authenticated. Review credential issuance, rotation, revocation, environment separation, least-privilege roles, privileged-access monitoring, and controls for support users. Production credentials should not be reused in test environments.
For APIs, confirm how expired credentials, replay attempts, repeated requests, and authorization failures behave. For an SDK, verify that privileged secrets are not embedded in client code and that sensitive operations are authorized by the backend.
Confirm how data is protected in transit and at rest, including backups and operational exports. Review whether logs, analytics, crash reports, and support tools can capture personal or financial information. Masking in the primary interface is not enough if unrestricted values remain in downstream logs.
Ask for a current data-flow diagram and an inventory of subprocessors or third-party services that participate in the journey.
The customer journey should make issuer identity, product terms, applicable protection, and required consent clear. Audit evidence should show what the customer saw and accepted, the timestamp, relevant version, and resulting system action.
Check whether booking, payment, KYC, nominee, and servicing status changes are traceable across the distributor and issuer. This becomes especially important during reconciliation or a customer complaint.
Evaluate secure-development practices, dependency management, vulnerability testing, patch timelines, secrets management, change approvals, and production monitoring. Ask how findings are prioritized and how remediation evidence is shared with enterprise partners.
A security review should cover the public API, SDK, administrative systems, cloud infrastructure, and operational processes. Testing one visible component does not establish the security of the complete service.
Review availability measurement, severity definitions, alerting, escalation paths, recovery expectations, dependency failures, and customer communication. Confirm how the system behaves when a payment succeeds but an issuer response is delayed, or when a repeated request reaches the booking service.
Use the FD SDK SLA evaluation guide to connect security incidents with support and recovery commitments.
A useful sandbox should test more than the happy path. Engineering teams should be able to exercise invalid data, expired sessions, KYC exceptions, payment uncertainty, repeated requests, issuer delays, callbacks, and recovery flows. Before launch, review allowlists, credentials, callback security, monitoring, support contacts, and rollback ownership.
The Blostem FD SDK documentation hub outlines the integration and production-readiness areas teams should prepare.
Security language should be precise. Treat broad claims such as “bank grade” or “fully compliant” as a starting point for evidence, not the conclusion of the review.
For the wider selection process, use the FD SDK provider comparison checklist or review the current Blostem fixed deposit SDK.