curl --request GET \
  --url http://localhost:8080/users/{user_id}/mandates

{
  "data": [
    {
      "account_id": "<string>",
      "amount": {
        "value": 123
      },
      "created_at": "<string>",
      "id": "<string>",
      "last_modified_at": "<string>",
      "max_amount": {
        "value": 123
      },
      "user_id": "012345678901",
      "end_date": "<string>",
      "external_mandate_status": "<string>",
      "external_order_status": "<string>",
      "job_id": "<string>",
      "mandate_id": "<string>",
      "payment_method": "<string>",
      "payment_method_type": "<string>",
      "start_date": "<string>"
    }
  ],
  "limit": 123,
  "offset": 123,
  "total": 123
}