Limit Domain Registration on WooCommerce

Question

How to limit access to specific domains on WooCommerce registration for user email?

I found this snippet of code that can do that, but it doesn't work on the WooCommerce Registration form for some reason.

It works if I go to the WP-login page though.

Any help is appreciated.

function is_valid_email_domain($login, $email, $errors ){

    $valid_email_domains = array("gmail.com", "yahoo.com");// allowed domains
    $valid = false; // sets default validation to false
    foreach( $valid_email_domains as $d ){
        $d_length = strlen( $d );
        $current_email_domain = strtolower( substr( $email, -($d_length), $d_length));
        if( $current_email_domain == strtolower($d) ){
            $valid = true;
            break;
        }
    }
 // Return error message for invalid domains
    if( $valid === false ){
        $errors->add('domain_whitelist_error',__( '<strong>ERROR</strong>: Registration is only allowed from selected approved domains. If you think you are seeing this in error, please contact the system administrator.' ));
    }
}

add_action('register_post', 'is_valid_email_domain',10,3 ); //this works
// add_action('woocommerce_register_form', 'is_valid_email_domain',10,0); //getting errors
// add_action('user_register', 'is_valid_email_domain',10,3 ); //getting errors
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Answer 1

The correct hook to be used in WooCommerce is woocommerce_register_post action hook. Try this instead:

add_action('woocommerce_register_post','is_valid_registration_email_domain', 10, 3 );
function is_valid_registration_email_domain( $username, $email, $validation_errors ){
    $valid_email_domains = array( 'gmail.com', 'yahoo.com' ); // Allowed domains
    $valid = false; // sets default validation to false
    foreach( $valid_email_domains as $d ){
        $d_length = strlen( $d );
        $current_email_domain = strtolower( substr( $email, -($d_length), $d_length));
        if( $current_email_domain == strtolower($d) ){
            $valid = true;
            break;
        }
    }

    // Return error message for invalid domains
    if( ! $valid ){
        $error_text = __( "<strong>ERROR</strong>: Registration is only allowed from selected approved domains. If you think you are seeing this in error, please contact the system administrator.", "woocommerce" );
        $validation_errors->add( 'domain_whitelist_error', $error_text );
    }
}
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Code goes in function.php file of your active child theme (or theme).

Tested and works.