private function save_transaction( $post_id ) {

		// phpcs:disable WordPress.Security.NonceVerification.Missing -- Nonce is verified in the save() method of this class.

		if ( empty( $_POST['llms_txn_amount'] ) ) {
			return $this->add_error( __( 'Refund Error: Missing or invalid payment amount', 'lifterlms' ) );
		}

		$order = new LLMS_Order( $post_id );

		$txn = $order->record_transaction(
			array(
				'amount'             => llms_filter_input_sanitize_string( INPUT_POST, 'llms_txn_amount' ),
				'source_description' => llms_filter_input_sanitize_string( INPUT_POST, 'llms_txn_source' ),
				'transaction_id'     => llms_filter_input_sanitize_string( INPUT_POST, 'llms_txn_id' ),
				'status'             => 'llms-txn-succeeded',
				'payment_gateway'    => 'manual',
				'payment_type'       => 'single',
			)
		);

		if ( ! empty( $_POST['llms_txn_note'] ) ) {
			$order->add_note( llms_filter_input_sanitize_string( INPUT_POST, 'llms_txn_note' ), true );
		}

		if ( is_wp_error( $txn ) ) {
			$this->add_error( sprintf( _x( 'Refund Error: %s', 'admin error message', 'lifterlms' ), $refund->get_error_message() ) );
		}

		// phpcs:enable WordPress.Security.NonceVerification.Missing

	}