public function process_refund( $amount, $note = '', $method = 'manual' ) {

		// Ensure the transaction is still eligible for a refund.
		if ( ! $this->can_be_refunded() ) {
			return new WP_Error(
				'llms-txn-refund-not-eligible',
				__( 'The selected transaction is not eligible for a refund.', 'lifterlms' )
			);
		}

		$amount = floatval( $amount );

		// Ensure we can refund the requested amount.
		$refundable = $this->get_refundable_amount();
		if ( $amount > $refundable ) {
			return new WP_Error(
				'llms-txn-refund-amount-too-high',
				sprintf(
					// Translators: %1$s = The requested refund amount; %2$s = the available refundable amount.
					__( 'Requested refund amount was %1$s, the maximum possible refund for this transaction is %2$s.', 'lifterlms' ),
					llms_price( $amount ),
					llms_price( $refundable )
				)
			);
		}

		$id = $this->generate_refund_id( $method, $amount, $note );
		if ( is_string( $id ) ) {
			$this->record_refund( compact( 'amount', 'id', 'method' ), $note );
		} elseif ( ! is_wp_error( $id ) ) {
			$id = new WP_Error( 'llms-txn-refund-unknown-error', __( 'An unknown error occurred while processing the refund.', 'lifterlms' ) );
		}

		return $id;

	}