Validates port-in data against provider requirements without creating a port-in. Use this endpoint to check whether the submitted fields, phone number, and execution date would pass provider validation before committing to a port-in submission.

The executionDate must be one of the type's executionDate.dates from GET /v1/port-ins/fields/{countryCode}, which hold until its validUntil. The date is checked once everything else passes: a date outside them is then refused with 400 BAD_REQUEST, not valid: false.

This is a dry-run operation — no resources are created or modified.

{
  "countryCode": "DE",
  "type": "personal",
  "msisdn": "+4915112345678",
  "executionDate": "2027-03-01",
  "fields": {
    "currentCarrier": "CONG",
    "authorizationCode": "1985-04-12",
    "ownerFirstName": "Erika",
    "ownerLastName": "Mustermann",
    "isUnlocked": true
  }
}

{
  "valid": true,
  "errors": [
    {
      "message": "A PAC is 3 letters, then 6 digits (e.g. ABC123456). 6 digits then 3 letters is a STAC, not a PAC.",
      "field": "authorizationCode",
      "code": "FORMAT_INVALID"
    }
  ]
}