Force Stripe Test Mode in WooCommerce

force-stripe-testmode.php

<?php

/**
 * Plugin Name:     Force Stripe Test Mode
 * Plugin URI:      https://tenseg.net
 * Description:     Forces Stripe into test mode if TG_STRIPE_TEST_MODE defined as 'yes'.
 * Author:          Tenseg LLC
 * Author URI:      https://tenseg.net
 * Text Domain:     force-stripe-test-mode
 * Version:         1.0.0
 *
 * @package         force-stripe-test-mode
 */

// based on https://stackoverflow.com/a/40564861/822151
add_action( 'init', 'tg_check_if_stripe_should_be_testing' );
function tg_check_if_stripe_should_be_testing() {
	if ( defined( 'TG_STRIPE_TEST_MODE' ) && constant( 'TG_STRIPE_TEST_MODE' ) == 'yes' ) {
		$settings = get_option( 'woocommerce_stripe_settings' );
		if ( rgar( $settings, 'testmode' ) != 'yes' ) {
			$settings['testmode'] = 'yes';
			update_option( 'woocommerce_stripe_settings', $settings );
		}
	}
}