Custom input validation

Hi, I am trying to check if a specific field contains the number “300”. I tried this code, but it did not work. Does some one here know if I am doing something wrong?

add_action( 'woocommerce_after_checkout_validation', 'misha_validate_fname_lname', 10, 2);
 
function misha_validate_fname_lname( $fields, $errors ){
 
    if ( strpos( $fields[ 'billing_n_matricula' ], 300) === false   ){
        $errors->add( 'validation', 'Seu número de matrícula parece estar errado, favor digitar o correto.' );
    }
}

Tks! ??

• This topic was modified 5 years, 3 months ago by diegpl.