functions.php

// Bestellstatus nach Stripe->Sofortüberweisung direkt auf fertiggestellt

add_action( 'woocommerce_thankyou', 'sofort_force_order_complete', 10, 1 );

function sofort_force_order_complete( $order_get_id ) {

	$order = new WC_Order($order_get_id);


	if($order->get_payment_method() == 'stripe_sofort') {

		$order->update_status('completed', 'order_note');
    }

};