FDE-006field-patterns/customer-api-onboarding.mdUPDATED: 06/18/2026
Customer API Onboarding
Pattern
Name: Customer API onboarding
When to use it: When an implementation needs to connect to a customer's API or let the customer connect to yours.
Why it matters for FDE roles: API integrations are often where demos become real implementations and hidden operational details appear.
Plain-English Description
Customer API onboarding is the process of turning an available API into a working, secure, observable integration with agreed data behavior and ownership.
Situation Signals
- Job listing signal: API integration, implementation, auth, webhooks, customer systems.
- Customer signal: the customer has an API but unclear credentials, schemas, limits, or ownership.
- Project signal: prototype depends on real customer data or writeback.
What To Ask
- Which system is authoritative for each field?
- What auth method, scopes, and environments are available?
- What are the rate limits, pagination rules, and webhook behaviors?
- What should happen on duplicate, failed, or out-of-order events?
What To Do
- Confirm sandbox and production credentials.
- Map fields and validation rules.
- Implement retries, idempotency, and error visibility.
- Create a go-live and rollback plan.
Artifacts To Produce
- Diagram: integration flow and data ownership.
- Checklist: auth, schema, webhooks, retries, rate limits, go-live.
- Demo/prototype: one read path and one safe write or mock write path.
- Customer-facing note: integration assumptions and support plan.
Failure Modes
- Sandbox behavior differs from production.
- Missing scopes or expired credentials.
- Duplicate records from retries.
- Webhooks arrive out of order.
- No owner for failed records.
Interview Language
One sentence I could say in an interview:
I treat customer API onboarding as an operational handoff: auth, schema, retries, idempotency, logs, ownership, and go-live behavior all need to be explicit.
Relevant work experience for this pattern: