using RestSharp;


var options = new RestClientOptions("https://api.sandbox.{id}.gr4vy.app/merchant-accounts");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("Authorization", "Bearer <token>");
var response = await client.GetAsync(request);

Console.WriteLine("{0}", response.Content);

{
  "items": [
    {
      "type": "merchant-account",
      "id": "plantly-uk",
      "display_name": "Plantly UK",
      "outbound_webhook_url": "https://www.example.com/webhook",
      "outbound_webhook_username": "gr4vy",
      "outbound_webhook_password": "********",
      "visa_network_tokens_requestor_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "visa_network_tokens_app_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "amex_network_tokens_requestor_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "amex_network_tokens_app_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "mastercard_network_tokens_requestor_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "mastercard_network_tokens_app_id": "e50fa0da-903d-4d54-aacc-4cac57d48df2",
      "loon_client_key": "7DD771287D0024BA418F8F7ECC7DF1CD",
      "loon_secret_key": "********",
      "loon_accepted_schemes": [
        "mastercard",
        "visa"
      ],
      "account_updater_enabled": true,
      "account_updater_request_encryption_key": "example-encryption-key",
      "account_updater_request_encryption_key_id": "example-encryption-key-id",
      "account_updater_response_decryption_key": "example-decryption-key",
      "account_updater_response_decryption_key_id": "example-decryption-key-id",
      "created_at": "2022-02-01T14:20:00.000+00:00",
      "updated_at": "2022-02-01T14:20:00.000+00:00",
      "over_capture_amount": 1000,
      "over_capture_percentage": 20
    }
  ],
  "limit": 1,
  "next_cursor": "ZXhhbXBsZTE",
  "previous_cursor": null
}