id ) {
		$wc_order = wc_get_order( $order_id );
		// phpcs:disable WordPress.Security.NonceVerification.Missing
		$birth_date = wc_clean( wp_unslash( $_POST['billing_birth_date'] ?? '' ) );
		// phpcs:disable WordPress.Security.NonceVerification.Recommended
		$pay_for_order = wc_clean( wp_unslash( $_GET['pay_for_order'] ?? '' ) );
		if ( 'true' === $pay_for_order ) {
			if ( ! $this->checkout_helper->validate_birth_date( $birth_date ) ) {
				wc_add_notice( 'Invalid birth date.', 'error' );
				return array(
					'result' => 'failure',
				);
			}
		}

		$phone_number = wc_clean( wp_unslash( $_POST['billing_phone'] ?? '' ) );
		// phpcs:enable WordPress.Security.NonceVerification.Missing
		if ( $phone_number ) {
			$wc_order->set_billing_phone( $phone_number );
			$wc_order->save();
		}

		$purchase_unit  = $this->purchase_unit_factory->from_wc_order( $wc_order );
		$payment_source = $this->payment_source_factory->from_wc_order( $wc_order, $birth_date );

		try {
			$order = $this->order_endpoint->create( array( $purchase_unit ), $payment_source, $wc_order );
			$this->add_paypal_meta( $wc_order, $order, $this->environment );
			$wc_order->update_status( 'on-hold', __( 'Awaiting Pay upon Invoice payment.', 'woocommerce-paypal-payments' ) );

			as_schedule_single_action(
				time() + ( 5 * MINUTE_IN_SECONDS ),
				'woocommerce_paypal_payments_check_pui_payment_captured',
				array(
					'wc_order_id' => $order_id,
					'order_id'    => $order->id(),
				)
			);

			WC()->cart->empty_cart();

			return array(
				'result'   => 'success',
				'redirect' => $this->get_return_url( $wc_order ),
			);
		} catch ( RuntimeException $exception ) {
			$error = $exception->getMessage();
			if ( is_a( $exception, PayPalApiException::class ) ) {
				$error = $exception->get_details( $error );
			}

			$this->logger->error( $error );
			wc_add_notice( $error, 'error' );

			$wc_order->update_status(
				'failed',
				$error
			);

			return array(
				'result'   => 'failure',
				'redirect' => wc_get_checkout_url(),
			);
		}
	}

	/**
	 * Process refund.
	 *
	 * @param  int    $order_id Order ID.
	 * @param  float  $amount Refund amount.
	 * @param  string $reason Refund reason.
	 * @return boolean True or false based on success, or a WP_Error object.
	 */
	public function process_refund( $order_id, $amount = null, $reason = '' ) {
		$order = wc_get_order( $order_id );
		if ( ! is_a( $order, \WC_Order::class ) ) {
			return false;
		}
		return $this->refund_processor->process( $order, (float) $amount, (string) $reason );
	}

	/**
	 * Return transaction url for this gateway and given order.
	 *
	 * @param WC_Order $order WC order to get transaction url by.
	 *
	 * @return string
	 */
	public function get_transaction_url( $order ): string {
		$this->view_transaction_url = $this->transaction_url_provider->get_transaction_url_base( $order );

		return parent::get_transaction_url( $order );
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WooCommerce\PayPalCommerce\WcGateway\Gateway\PayUponInvoice\PayUponInvoiceGateway' not found in /home1/tetban11/public_html/wp-content/plugins/woocommerce-paypal-payments/modules/ppcp-uninstall/services.php:30
Stack trace:
#0 /home1/tetban11/public_html/wp-content/plugins/woocommerce-paypal-payments/lib/packages/Dhii/Container/DelegatingContainer.php(117): WooCommerce\PayPalCommerce\Uninstall\UninstallModule-&gt;WooCommerce\PayPalCommerce\Uninstall\{closure}(Object(WooCommerce\PayPalCommerce\Vendor\Dhii\Container\DelegatingContainer))
#1 /home1/tetban11/public_html/wp-content/plugins/woocommerce-paypal-payments/lib/packages/Dhii/Container/DelegatingContainer.php(56): WooCommerce\PayPalCommerce\Vendor\Dhii\Container\DelegatingContainer-&gt;invokeFactory(Object(Closure))
#2 /home1/tetban11/public_html/wp-content/plugins/woocommerce-paypal-payments/lib/packages/Dhii/Container/CompositeContainer.php(53): WooCommerce\PayPalCommerce\Vendor\Dhii\Container\DelegatingContainer-&gt;get('uninstall.ppcp-... in <b>/home1/tetban11/public_html/wp-content/plugins/woocommerce-paypal-payments/modules/ppcp-uninstall/services.php</b> on line <b>30</b><br />