AyeCode / invoicing

	 * @param int $invoice_id Supplied ID.

	 * @return WPInv_Invoice|WP_Error Invoice object if ID is valid, WP_Error otherwise.

	 */

	protected function get_post( $invoice_id ) {

		$error     = new WP_Error( 'rest_invoice_invalid_id', __( 'Invalid invoice ID.', 'invoicing' ), array( 'status' => 404 ) );

        // Ids start from 1

        if ( (int) $invoice_id <= 0 ) {

			return $error;

		}

		$invoice = wpinv_get_invoice( (int) $invoice_id );

		if ( empty( $invoice ) ) {

			return $error;

        }

        return $invoice;

    }

    /**

	 * Checks if a given request has access to read an invoice.

	 * @param int $item_id Supplied ID.

	 * @return WPInv_Item|WP_Error Item object if ID is valid, WP_Error otherwise.

	 */

	protected function get_post( $item_id ) {

		$error     = new WP_Error( 'rest_item_invalid_id', __( 'Invalid item ID.', 'invoicing' ), array( 'status' => 404 ) );

        // Ids start from 1

        if ( (int) $item_id <= 0 ) {

			return $error;

		}

		$item = wpinv_get_item_by( 'id', (int) $item_id );

		if ( empty( $item ) ) {

			return $error;

        }

        return $item;

    }

    /**

	 * Checks if a given request has access to read an invoice item.