Updates a client with the passed parameters.

Request Parameters

Parameter Type Description Required
action string “UpdateClient” Required
clientid int The id of the client to update Optional
clientemail string The email address of the client to update. Either $clientid or $clientemail is required Optional
firstname string Optional
lastname string Optional
companyname string Optional
email string Optional
address1 string Optional
address2 string Optional
city string Optional
state string Optional
postcode string Optional
country string 2 character ISO country code Optional
phonenumber string Optional
password2 string Optional
securityqid int Security Question ID from tbladminsecurityquestions Optional
securityqans string Security Question Answer Optional
cardtype string Credit card type. Provide full name: Visa, Mastercard, American Express, etc… Optional
cardnum string Credit card number Optional
expdate string Format: MMYY Optional
startdate string Format: MMYY (if applicable) Optional
issuenumber string Credit card issue number (if applicable) Optional
bankcode string Client Bank Account Code (if applicable) Optional
bankacct string Client bank Account number (if applicable) Optional
cvv string Credit card CVV number (will not be stored) Optional
currency int Currency ID from tblcurrencies Optional
groupid int Client Group ID from tblclientgroups Optional
customfields string Base64 encoded serialized array of custom field values Optional
language string Default language setting. Provide full name: ‘english’, ‘french’, etc… Optional
clientip string IP address of the user Optional
notes string Admin only notes Optional
paymentmethod string The default payment method Optional
noemail bool Pass as true to skip sending welcome email Optional
clearcreditcard bool Pass as true to clear the stored CC details Optional
skipvalidation bool Pass as true to ignore required fields validation Optional

Response Parameters

Parameter Type Description
result string The result of the operation: success or error

Example Request (CURL)

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://www.example.com/includes/api.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            'action' => 'UpdateClient',
            // See https://developers.whmcs.com/api/authentication
            'username' => 'IDENTIFIER_OR_ADMIN_USERNAME',
            'password' => 'SECRET_OR_HASHED_PASSWORD',
            'clientid' => '1',
            'firstname' => 'John',
            'lastname' => 'Doe',
            'email' => [email protected]',
            'responsetype' => 'json',
$response = curl_exec($ch);

Example Request (Local API)

$command = 'UpdateClient';
$postData = array(
    'clientid' => '1',
    'firstname' => 'John',
    'lastname' => 'Doe',
    'email' => [email protected]',
$adminUsername = 'ADMIN_USERNAME'; // Optional for WHMCS 7.2 and later

$results = localAPI($command, $postData, $adminUsername);

Example Response JSON

    "result": "success",
    "clientid": "1"

Error Responses

Possible error condition responses include:

  • Client ID Not Found
  • Duplicate Email Address

Version History

Version Changelog
1.0 Initial Version