Create adapters for KYC, card issuing, accounts, and money movement, with deterministic fallbacks and circuit breakers. This approach protects client roadmaps when a provider pauses features or alters SLAs. Keep a shared domain model independent of vendor quirks, and map discrepancies at the edge. Invest in clear error hierarchies, consistent retry strategies, and synthetic monitoring that catches upstream issues before clients notice. Your team becomes the stability layer clients rely on when platforms reshuffle integrations mid‑quarter.
Treat webhooks as a first‑class product surface. Persist every event, sign and verify payloads, and record delivery attempts with exponential backoff. Build idempotency keys across writes, then expose correlation IDs in logs so support can trace flows quickly. Use dead‑letter queues and replay tooling for safe recovery during incidents. Publish a runbook describing expected event sequences and remediation steps. When auditors or partner banks ask for proof of control, your architecture and dashboards speak calmly and convincingly.
Design onboarding like a guided conversation: progressive data capture, early document collection, and conditional steps for higher‑risk entities. Offer save‑and‑resume, localized copy, and accessible file uploads. Expose reason codes for declines and simple re‑try paths. For businesses, support beneficial ownership attestations, officer verification, and sanctions screening transparency. Store only what you need, encrypt everywhere, and document retention schedules. Teams that treat verification UX as a product win more activations and avoid endless support exchanges over ambiguous decisions.