I'm facing Verification failed error on Checkout page using Woocommerce and Divi theme.

You need to add a hook to the google-captcha-pro.php file

function gglcptch_add_responce_field_to_order() {
   $is_user_logged_in = is_user_logged_in();
   if ( gglcptch_is_recaptcha_required( 'woocommerce_checkout', $is_user_logged_in ) ) {
    remove_action( 'woocommerce_after_checkout_billing_form', 'gglcptch_echo_recaptcha' );
    add_action( 'woocommerce_review_order_before_submit', 'gglcptch_echo_recaptcha', 10, 0 );
  }
}

add_action( 'init', 'gglcptch_add_responce_field_to_order' );

This article related to reCaptcha by BestWebSoft plugin

Additional resources: reCaptcha - User Guide

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