# ✅ Validate a draft and submit as invoice

Validate a draft and convert it to a structured invoice in the specified format.

This endpoint performs comprehensive validation and converts the draft
into a final invoice that will be submitted to the PPF platform.
After successful validation, the draft becomes immutable.

Endpoint: POST /drafts/{draft_id}/validate
Version: 1.0.0

## Path parameters:

  - `draft_id` (string, required)

## Header parameters:

  - `X-PDP-Client-Id` (string, required)
    ID of the PDP Client for which the operation is performed

## Request fields (application/json):

  - `format` (string, required)
    Enum: "factur-x", "ubl", "cii"

## Response 200 fields (application/json):

  - `invoice_id` (string, required)

  - `status` (string, required)
    Enum: "draft", "submitted", "validated", "rejected", "processed"

## Response 400 fields (application/json):

  - `error` (string, required)

  - `code` (integer, required)

  - `trace_id` (string, required)

## Response 401 fields (application/json):

  - `error` (string, required)

  - `code` (integer, required)

  - `trace_id` (string, required)

## Response 422 fields (application/json):

  - `detail` (array)

  - `detail.loc` (array, required)

  - `detail.msg` (string, required)

  - `detail.type` (string, required)


## Response 404 fields