How Fintech Platforms Should Handle Domain Verification During Tenant Onboarding

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A technical guide from DEV Community outlines best practices for verifying domain ownership during fintech tenant onboarding, distinguishing between platform-owned and customer-owned hostnames. For platform-controlled subdomains, verification should be tied directly to the platform's own DNS provisioning workflow, with no customer action required. When a customer controls the domain, platforms should run scheduled background DNS checks and offer a rate-limited manual recheck as a faster feedback option, not as a definitive source of truth. The guide warns that repeated manual rechecks cannot override DNS caching, so verifiers should report only what their resolver observed rather than implying global propagation. Separate UI states — such as 'awaiting DNS', 'verified', and 'ready to serve' — are recommended to keep the onboarding experience transparent and accurate.

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