Integrate an e-invoicing API

The correct sequence

Electronic invoicing problems are often caused by performing the right check at the wrong layer. Follow the sequence below and keep evidence from each stage.

1. 1
   Choose the official or provider API

   Define a canonical invoice model and keep it independent from one authority payload.

2. 2
   Map the invoice model

   Map each target profile with versioned transformations, validation and test fixtures.

3. 3
   Implement security and idempotency

   Implement authentication, idempotency, retry, rate-limit and webhook controls.

4. 4
   Handle asynchronous status and errors

   Normalize authority responses without discarding the original response or correlation identifiers.

Inputs to collect before starting

• The country, transaction type and legal entities involved
• The original structured invoice and its unmodified response
• The intended schema/profile version and delivery channel
• Sender, receiver and routing identifiers
• Authority or provider timestamps, correlation IDs and status codes

Quality controls

Completion evidence

A completed workflow should produce a small evidence pack rather than only a green screen.

• Document hash and immutable source copy
• Detected profile and validation versions
• Machine-readable validation report
• Human-readable review copy
• Official or network response when applicable
• Correction and resubmission history