curl --request PUT \
  --url https://serengo.zias.be/api/friends/{friendshipId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": "accept"
}
'

{
  "id": "<string>",
  "requesterId": "<string>",
  "addresseeId": "<string>",
  "status": "pending",
  "requester": {
    "id": "<string>",
    "username": "<string>",
    "profilePicture": "<string>"
  },
  "addressee": {
    "id": "<string>",
    "username": "<string>",
    "profilePicture": "<string>"
  }
}