API integration errors

Top root causes

• Expired key or invalid scope on API token.
• Wrong endpoint base URL between staging and production.
• Unexpected payload field names or missing headers.
• Network timeout with no retry fallback configured.

Debug flow

• Log request ID, response code, and latency for every call.
• Replay failed payloads in staging endpoint.
• Compare webhook signatures and HMAC secret values.
• Check rate limit headers before retrying bursts.

Hardening recommendations

• Add idempotency key for payment and order endpoints.
• Use structured error format with clear machine codes.
• Alert when error rate exceeds your defined threshold.
• Keep webhook dead-letter queue for failed deliveries.