In order to synchronize emaildelivery with an ERP system and keep a history of broadcasts per contact, you need to be able to perform the following operations with the API:

GET /contactdata/{Id}

Create endpoint

PATCH /contactdata/{Id}

Create endpoint (with the possibility to modify the email address)

DELETE /contactdata/{Id}

Create endpoint

POST /lists/{id}/feed

Modify endpoint to receive the contact ID

Thank you!