If you are using our free Authorize.Net extension and want to use AIM emulation method, you will need to add a few lines of code as written below to your theme's functions.php or in a custom plugin or wherever you have other custom functions written for your site. Please make sure to change the POST URL from ' https://my-custom-emulation-url.com/gateway/transact.dll' to your actual emulation URL.
function wc_authnet_custom_transaction_url( $post_url ) { return 'https://my-custom-emulation-url.com/gateway/transact.dll'; //REPLACE URL HERE } add_filter( 'wc_authnet_request_url', 'wc_authnet_custom_transaction_url' );
P.S. Unfortunately, the Authorize.Net emulation method is deprecated, and will soon be phased out. If you are using another merchant account provider that supports Authorize.Net AIM emulator, we would advise you to use it's native API instead of emulation and chances are that we already have a WooCommerce integration available for it.