protected function save_variations( $product, $request ) {
		global $wpdb;

		$id         = $product->get_id();
		$attributes = $product->get_attributes();

		foreach ( $request['variations'] as $menu_order => $data ) {
			$variation_id = isset( $data['id'] ) ? absint( $data['id'] ) : 0;
			$variation    = new WC_Product_Variation( $variation_id );

			// Create initial name and status.
			if ( ! $variation->get_slug() ) {
				/* translators: 1: variation id 2: product name */
				$variation->set_name( sprintf( __( 'Variation #%1$s of %2$s', 'woocommerce' ), $variation->get_id(), $product->get_name() ) );
				$variation->set_status( isset( $data['visible'] ) && false === $data['visible'] ? 'private' : 'publish' );
			}

			// Parent ID.
			$variation->set_parent_id( $product->get_id() );

			// Menu order.
			$variation->set_menu_order( $menu_order );

			// Status.
			if ( isset( $data['visible'] ) ) {
				$variation->set_status( false === $data['visible'] ? 'private' : 'publish' );
			}

			// SKU.
			if ( isset( $data['sku'] ) ) {
				$variation->set_sku( wc_clean( $data['sku'] ) );
			}

			// Thumbnail.
			if ( isset( $data['image'] ) && is_array( $data['image'] ) ) {
				$image = current( $data['image'] );
				if ( is_array( $image ) ) {
					$image['position'] = 0;
				}

				$variation = $this->save_product_images( $variation, array( $image ) );
			}

			// Virtual variation.
			if ( isset( $data['virtual'] ) ) {
				$variation->set_virtual( $data['virtual'] );
			}

			// Downloadable variation.
			if ( isset( $data['downloadable'] ) ) {
				$is_downloadable = $data['downloadable'];
				$variation->set_downloadable( $is_downloadable );
			} else {
				$is_downloadable = $variation->get_downloadable();
			}

			// Downloads.
			if ( $is_downloadable ) {
				// Downloadable files.
				if ( isset( $data['downloads'] ) && is_array( $data['downloads'] ) ) {
					$variation = $this->save_downloadable_files( $variation, $data['downloads'] );
				}

				// Download limit.
				if ( isset( $data['download_limit'] ) ) {
					$variation->set_download_limit( $data['download_limit'] );
				}

				// Download expiry.
				if ( isset( $data['download_expiry'] ) ) {
					$variation->set_download_expiry( $data['download_expiry'] );
				}
			}

			// Shipping data.
			$variation = $this->save_product_shipping_data( $variation, $data );

			// Stock handling.
			$manage_stock = (bool) $variation->get_manage_stock();
			if ( isset( $data['managing_stock'] ) ) {
				$manage_stock = $data['managing_stock'];
			}
			$variation->set_manage_stock( $manage_stock );

			$stock_status = $variation->get_stock_status();
			if ( isset( $data['in_stock'] ) ) {
				$stock_status = true === $data['in_stock'] ? 'instock' : 'outofstock';
			}
			$variation->set_stock_status( $stock_status );

			$backorders = $variation->get_backorders();
			if ( isset( $data['backorders'] ) ) {
				$backorders = $data['backorders'];
			}
			$variation->set_backorders( $backorders );

			if ( $manage_stock ) {
				if ( isset( $data['stock_quantity'] ) ) {
					$variation->set_stock_quantity( $data['stock_quantity'] );
				}
			} else {
				$variation->set_backorders( 'no' );
				$variation->set_stock_quantity( '' );
			}

			// Regular Price.
			if ( isset( $data['regular_price'] ) ) {
				$variation->set_regular_price( $data['regular_price'] );
			}

			// Sale Price.
			if ( isset( $data['sale_price'] ) ) {
				$variation->set_sale_price( $data['sale_price'] );
			}

			if ( isset( $data['sale_price_dates_from'] ) ) {
				$variation->set_date_on_sale_from( $data['sale_price_dates_from'] );
			}

			if ( isset( $data['sale_price_dates_to'] ) ) {
				$variation->set_date_on_sale_to( $data['sale_price_dates_to'] );
			}

			// Tax class.
			if ( isset( $data['tax_class'] ) ) {
				$variation->set_tax_class( $data['tax_class'] );
			}

			// Update taxonomies.
			if ( isset( $data['attributes'] ) ) {
				$_attributes = array();

				foreach ( $data['attributes'] as $attribute_key => $attribute ) {
					if ( ! isset( $attribute['name'] ) ) {
						continue;
					}

					$taxonomy   = 0;
					$_attribute = array();

					if ( isset( $attribute['slug'] ) ) {
						$taxonomy = $this->get_attribute_taxonomy_by_slug( $attribute['slug'] );
					}

					if ( ! $taxonomy ) {
						$taxonomy = sanitize_title( $attribute['name'] );
					}

					if ( isset( $attributes[ $taxonomy ] ) ) {
						$_attribute = $attributes[ $taxonomy ];
					}

					if ( isset( $_attribute['is_variation'] ) && $_attribute['is_variation'] ) {
						$_attribute_key = sanitize_title( $_attribute['name'] );

						if ( isset( $_attribute['is_taxonomy'] ) && $_attribute['is_taxonomy'] ) {
							// Don't use wc_clean as it destroys sanitized characters
							$_attribute_value = isset( $attribute['option'] ) ? sanitize_title( stripslashes( $attribute['option'] ) ) : '';
						} else {
							$_attribute_value = isset( $attribute['option'] ) ? wc_clean( stripslashes( $attribute['option'] ) ) : '';
						}

						$_attributes[ $_attribute_key ] = $_attribute_value;
					}
				}

				$variation->set_attributes( $_attributes );
			}

			$variation->save();

			do_action( 'woocommerce_api_save_product_variation', $variation_id, $menu_order, $variation );
		}

		return true;
	}