Step 1: Open your FTP or cPanel.

Step 2: Now navigate to the WHMCS server path where you are uploaded “order” folder  shown below in the screenshot


Step 3 : Now navigate to the path shown below in the screenshot (/order/config) and find “config.js” file .

Step 4 : open  config_opc.js  file and the put the “google Captcha SiteKey” on this path

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Step 5: save and exit file and hard reload your orderform page on the browser.