AyeCode / invoicing

                wpinv_set_payment_transaction_id( $invoice_id, $request['transId'] );

                wpinv_insert_payment_note( $invoice_id, sprintf( __( 'Worldpay Transaction ID: %s', 'invoicing' ), $request['transId'] ) );

                return;

            } else if ( $request['transStatus'] == 'C' ) {

                wpinv_update_payment_status( $invoice_id, 'wpi-failed' );

                wpinv_insert_payment_note( $invoice_id, __( 'Payment transaction failed while processing Worldpay payment, kindly check IPN log.', 'invoicing' ) );

                wpinv_record_gateway_error( __( 'IPN Error', 'invoicing' ), sprintf( __( 'Payment transaction failed while processing Worldpay payment. IPN data: %s', 'invoicing' ), json_encode( $request ) ), $invoice_id );

                return;

            }

        }

    }

    return;

	}

	// Verify payment currency

	if ( $currency_code != strtolower( $payment_meta['currency'] ) ) {

		wpinv_record_gateway_error( __( 'IPN Error', 'invoicing' ), sprintf( __( 'Invalid currency in IPN response. IPN data: %s', 'invoicing' ), json_encode( $data ) ), $invoice_id );

		wpinv_update_payment_status( $invoice_id, 'wpi-failed' );

		wpinv_insert_payment_note( $invoice_id, __( 'Payment failed due to invalid currency in PayPal IPN.', 'invoicing' ) );

		return;

	}

	if ( !wpinv_get_payment_user_email( $invoice_id ) ) {

		// This runs when a Buy Now purchase was made. It bypasses checkout so no personal info is collected until PayPal

			wpinv_insert_payment_note( $invoice_id, __( 'Payment failed due to invalid amount in PayPal IPN.', 'invoicing' ) );

			return;

		}

		if ( $purchase_key != wpinv_get_payment_key( $invoice_id ) ) {

			// Purchase keys don't match

			wpinv_record_gateway_error( __( 'IPN Error', 'invoicing' ), sprintf( __( 'Invalid purchase key in IPN response. IPN data: %s', 'invoicing' ), json_encode( $data ) ), $invoice_id );

			wpinv_update_payment_status( $invoice_id, 'wpi-failed' );

			wpinv_insert_payment_note( $invoice_id, __( 'Payment failed due to invalid purchase key in PayPal IPN.', 'invoicing' ) );

			return;

		}

		if ( 'complete' == $payment_status || 'completed' == $payment_status || 'processed' == $payment_status || wpinv_is_test_mode( 'paypal' ) ) {

			wpinv_insert_payment_note( $invoice_id, sprintf( __( 'PayPal Transaction ID: %s', 'invoicing' ) , $data['txn_id'] ) );