Before building a WordPress integration, define the event that starts it, the record it must create or change, and the evidence that proves completion. A connection that returns HTTP 200 can still write to the wrong account, create duplicates, or silently discard fields.
Name the Business Contract
Replace “connect our form to the CRM” with a precise example: an accepted quotation request creates or updates a contact in a named workspace, attaches the enquiry to that contact, and records the resulting identifiers. Specify what should happen when the same person submits a second enquiry.
Decide which system owns each field. If both systems can change an address, define conflict resolution instead of letting the most recent background job overwrite it unpredictably.
| Field |
Decision to record |
| Source record ID |
Stable reference used for tracing and duplicate handling |
| Email or customer identifier |
Required format and matching rule |
| Consent |
Purpose, captured state, and allowed destination |
| Optional values |
Omit, send null, or preserve the destination value |
| Timestamp |
Time zone, event time, and processing time |
Plan Authentication and Authorization Separately
Identify the account that runs the integration and the capabilities it requires. Do not use a personal administrator credential as an unexplained permanent dependency. Document rotation, revocation, and who receives authentication-failure alerts.
For custom WordPress REST endpoints, the official endpoint guide distinguishes input validation from permission checks. A request containing valid JSON is not automatically authorized to change a customer record.
Define Failure Before Writing the Happy Path
Consider a destination that saves the contact but the response is lost. Retrying blindly can create a second contact. Specify an idempotency key supported by the destination or a reliable lookup-and-reconciliation strategy. A local “attempted” flag is not proof that the remote write did or did not happen.
Classify errors. Invalid required data should enter a review queue with a reason, not retry forever. Rate limiting should respect the provider's documented retry behavior. Authentication failures need an operator, not a growing stack of identical requests. Apply bounded retries and a visible terminal state.
Test sheet for wordpress custom integration checklist before you build. Record your own evidence.
Keep the Logs Useful Without Copying Everything
Log safe identifiers, operation type, attempt time, status, and a redacted reason. Do not dump full form submissions or secrets into logs by default. Agree on retention and deletion behavior, including copies in queues and error exports.
Separate required business processing from optional advertising measurement. If the integration also sends analytics, follow the approved consent design. Google's consent setup guidance describes tag behavior, but a tag setting alone does not decide which CRM data your business may process.
Accept the Integration With Deliberate Failure Tests
Test a valid submission, missing field, repeated source event, expired credential, destination timeout, and a destination record that already exists. For every case, name the expected record count and the expected operator-visible status.
Use synthetic data in a test workspace. Reconcile source IDs to destination IDs before declaring the integration complete. The missing CRM lead runbook is the operating procedure for an integration already failing in production.
Turn these decisions into a feature brief. When an existing connection needs repair, HandL WP's one-time fix can focus on the failed checkpoint instead of rebuilding an entire pipeline without evidence.
References checked September 28, 2026. Diagrams and worked examples are explanatory, not customer measurements.