Fill checkout fields values from URL variables in Woocommerce
Here below is an example with billing first name and last name based on Get url variables for checkout fields.
Its based on your Url example: checkout/?FirstName=Test&LastName=Test&EmailAddress=Test
The code:
add_filter( 'woocommerce_checkout_get_value' , 'custom_checkout_get_value', 20, 2 );function custom_checkout_get_value( $value, $imput ) { // Billing first name if(isset($_GET['FirstName']) && ! empty($_GET['FirstName']) && $imput == 'billing_first_name' ) $value = esc_attr( $_GET['FirstName'] ); // Billing last name if(isset($_GET['LastName']) && ! empty($_GET['LastName']) && $imput == 'billing_last_name' ) $value = esc_attr( $_GET['LastName'] ); // Billing email if(isset($_GET['EmailAddress']) && ! empty($_GET['EmailAddress']) && $imput == 'billing_email' ) $value = sanitize_email( $_GET['EmailAddress'] ); return $value;}Code goes in function.php file of your active child theme (or active theme). Tested and works.
