curl --request GET \
  --url https://api.ahasend.com/v2/accounts/{account_id}/smtp-credentials \
  --header 'Authorization: Bearer <token>'

{
  "object": "list",
  "data": [
    {
      "object": "smtp_credential",
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "name": "<string>",
      "username": "<string>",
      "sandbox": true,
      "scope": "global",
      "domains": [
        "<string>"
      ]
    }
  ],
  "pagination": {
    "has_more": true,
    "next_cursor": "eyJpZCI6MTIzNH0="
  }
}