post https://example.com/peppol-api/customers
To send PEPPOL invoices/documents, new customers must be registered first using this POST /customers endpoint.
This endpoint requires certain details about the customer to be provided, including their company name, contact info, and other relevant information.
Once the registration is successful, a response is returned containing the unique identifier for the newly registered customer. This identifier must be used in the X-Customer header when sending invoices later on.
Only registered customers are authorized to send Peppol invoices/documents, and any attempts to do so without proper registration may result in errors or rejection.