curl --request PATCH \
  --url https://api.fastcac.com/v1/registrations/{registration_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "proposed_names": [
    "Ada Foods Concepts"
  ]
}
'

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({proposed_names: ['Ada Foods Concepts']})
};

fetch('https://api.fastcac.com/v1/registrations/{registration_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.fastcac.com/v1/registrations/{registration_id}"

payload = { "proposed_names": ["Ada Foods Concepts"] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.fastcac.com/v1/registrations/{registration_id}"

	payload := strings.NewReader("{\n  \"proposed_names\": [\n    \"Ada Foods Concepts\"\n  ]\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.fastcac.com/v1/registrations/{registration_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'proposed_names' => [
        'Ada Foods Concepts'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "object": "registration",
  "id": "reg_4kMzPP2CrSMnY18kiANzau",
  "business_id": "biz_68mJv5UBBIPdMGYTvhnrKG",
  "external_id": "order-1182",
  "type": "business_name",
  "status": "draft",
  "proposed_names": [
    "ADA FOODS VENTURES",
    "ADA KITCHEN VENTURES"
  ],
  "line_of_business": "Educational Services And Consultancy",
  "business": {
    "email": "hello@adafoods.ng",
    "phone": "08039876543",
    "address": {
      "street_number": "12",
      "street": "Admiralty Way",
      "city": "Lekki",
      "lga": "Eti-Osa",
      "state": "Lagos",
      "postcode": "105102"
    }
  },
  "proprietors": [
    {
      "first_name": "Ada",
      "last_name": "Obi",
      "other_names": null,
      "gender": "female",
      "date_of_birth": "1990-04-12",
      "nationality": "Nigerian",
      "nin": "12345678901",
      "email": "ada@example.com",
      "phone": "08031234567",
      "address": {
        "street_number": "12",
        "street": "Admiralty Way",
        "city": "Lekki",
        "lga": "Eti-Osa",
        "state": "Lagos",
        "postcode": "105102"
      }
    }
  ],
  "missing_fields": [],
  "query": null,
  "failure": null,
  "registered_name": null,
  "registration_number": null,
  "certificate_available": false,
  "status_report_available": false,
  "history": [
    {
      "from": null,
      "to": "draft",
      "at": "2026-10-23T22:17:57Z"
    }
  ],
  "submitted_at": null,
  "approved_at": null,
  "created_at": "2026-10-23T22:17:57Z",
  "updated_at": "2026-10-23T22:17:57Z"
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "field_not_queried",
    "message": "While queried, only the queried fields can change (proposed_names, proprietors[0].documents.passport).",
    "param": "line_of_business",
    "request_id": "req_A0B0gsRD8kfAL5iau5naqUTX"
  }
}

{
  "error": {
    "type": "authentication_error",
    "code": "api_key_missing",
    "message": "Send your API key as `Authorization: Bearer <key>`.",
    "param": null,
    "request_id": "req_kdwpKsFMKS4VzLjqZJ0ntdrl"
  }
}

{
  "error": {
    "type": "permission_error",
    "code": "live_mode_unavailable",
    "message": "Live registrations aren't open yet. Use a test key (fc_test_…) for now.",
    "param": null,
    "request_id": "req_oYVCIHqeYbgIA3lIzwG0PO5r"
  }
}

{
  "error": {
    "type": "not_found_error",
    "code": "resource_missing",
    "message": "No such registration: reg_0000000000000000000000.",
    "param": "id",
    "request_id": "req_RlcFqswqrJZos4pnRMH3wa8d"
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "registration_locked",
    "message": "A registration can't be changed once it's pending_payment.",
    "param": null,
    "request_id": "req_OBaFD1jMQndl9toHEtuQE1yQ"
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "request_id": "<string>"
  }
}