Google has a very detailed data feed specification. This specification is divided into eight sections that apply to online sellers in North American and Europe. Each section has several required and accepted product attributes — columns in the spreadsheet.
Basic Product Information
The first data feed section is for communicating standard product information. Theses attribute names should appear as column titles in your spreadsheet. For column headers that contain more than one word, you should use an underscore character rather than a space, since the data feed will be passed in a text format.
- id is a unique product identification. It can be any combination of numbers and letters, but once it has been set and submitted it cannot change. Rather it will also be used to refer to a particular product as long as the product is listed.
- title is the name of the product. For example, “Converse All-Star Shoe.” Google recommends including identifying attributes like color or size in this title, so “Converse All-Star Shoe – Navy Blue – Size 10.”
- description is up to 1,000 characters of text explaining or describing the product. Google recommends using at least 500 characters.
- google_product_category is only required for products that are being submitted to the “Apparel and Accessories,” “Media,” and “Software” categories in the Google product taxonomy, but Google does recommend this attribute for all products. It is also important to note that you may only specify a single product category in this field, so choose the most applicable. The data you insert will take the form of “Apparel & Accessories > Shoes > Sneakers.” You will need to spend some time with the Google product taxonomy to discover what you should submit here.
- product_type is a somewhat redundant column that accepts a Google product category just like the google_product_category attribute mentioned above. Here, however, you may submit more than one category.
- link is a URL aimed directly at the product on your site. This field must begin with “http://” or “https://.” It must not link to a landing page or any page requiring registration. If symbols are used in the URL, those symbols must be replaced with URL encoded entities — see the explanation from W3Schools. For example a “?” is replaced with “%3F” and a “=” is replaced with “%3D.” Finally, the link must be to a domain you have already validated with the Google Merchant Center.
- image_link is not a required field, but it just makes sense to include a link to a product image. The image is stored on your servers, and must be at least 250 pixels by 250 pixels, although a larger image would be better, say 660 pixels by 660 pixels. Remember this is a link to the image, not a file name only, so “http://some-domain.com/some-img.jpg.”
- additional_image_link is specifically for providing additional product views, so from different angles as an example. You may include up to ten additional images, separating each image with a comma in your spreadsheet field.
- condition is a required field that may contain one of three options, “new,” “used,” or “refurbished.”
You are essentially building a spreadsheet with the attributes as column heads.
The next section of the spreadsheet is required to provide Google with your product prices and how many of each product that you have in inventory. Google encourages merchants to keep this data up to date.
- availability is a field that may contain one of four values: “in stock,” “available for order,” “out of stock,” or “preorder.”
- price is the item’s price before tax in the United States and with the value added tax in other nations. The field’s value will look something like “100.00 USD,” where “USD” stands for United States Dollars.
- sale_price is, as its name implies, a special price for a product. The field format is identical to the price field. When this option field is used, the product detail page associated with the product must display both the regular price and the sale price.
- sale_price_effective_date is a date range describing when a product should be considered to be on sale. This field takes the format of four-digit year, two-digit month, two-digit day, and time based on a 24-hour clock. For example, if an item was to go on sale on December 21, 2011 at 1:00 p.m., it would be “2011-12-21T13:00.” Notice that the “T” prefaces the time. A slash may be used to separate a starting and ending sale date. For example, if the sale above was to end on December 25, 2011 at 2:00 p.m., it would be “2011-12-21T13:00/2011-12-25T14:00.”
Unique Product Identification
Google also asks for some specific and unique information about each product.
- brand is the brand name of the product. It is required for all items except books, media, and custom made goods.
- gtin is the field for capturing a Global Trade Item Number like the UPC or ISBN code. It is not required if brand and manufacturer part number are used, but is still recommended if it is available.
- mpn is the manufacturer’s part number.
For U.S. merchants, Google requires some additional information for apparel products. Merchants in other nations are not required to submit this information, but Google has indicated that it may become required in the future.
- gender is answered with one of three options, “male,” “female,” and “unisex.”
- age_group is used to distinguish between “adult” and “kids.”
- color is used to describe the item’s dominant color.
- size is used for size information like XL, 30/36, or similar.
Tax and Shipping
There are three fields related to tax and shipping. You can also establish tax and shipping rules in the Merchant Center settings, so that these are essentially optional.
- tax is a relatively complicated grouped field that contains tax rate information for each jurisdiction for which the merchant is responsible to collect. Each jurisdiction is identified by an ISO 3166 country code, like “US” for the United States, followed by a region. In the U.S., the region can be a two-letter state abbreviation or zip code range where the “*” is used as a wildcard (i.e. 836*), representing any combination of numbers. The tax rate is included as a percentage. Finally, you must tell Google whether or not tax is charged on shipping. If you wanted to specify state tax for the U.S. State of Idaho at 6 percent and indicate not to charge tax on shipping, you would use “US:ID:6.00:n.” So that “US” stands for the United States, “ID” stands for Idaho, “6.00” percent is the tax rate, and the “n” means not to charge tax on shipping. If more than one jurisdiction should be specified, separate the values with a comma. Note that the colon must be present even if some value is omitted. So imagine a national U.S. sales tax of 9 percent in addition to the state sales tax., “US::9.00:n,US:ID:6.00:n .”
- shipping is used to specify estimated shipping charges for each product. This is optional, since general shipping information can be set up when you create a Google Merchant Center account. If you do use this field, it takes a format similar to the tax field in that there are groups that specify a country, region, service level, and price. So if ground shipping to New Mexico were $9.99, you would use, “US:NM:Ground:9.99.” Additional values would be separated with commas.
- shipping_weight is used to describe the weight of the item in pounds, ounces, grams, or kilograms. All told there are eight accepted units specifications, lb, pound, oz, ounce, g, gram, kg, kilogram. An example value would be “5 pounds” or “16 oz.”
For Multi-Channel Merchants
If your business sells both online and from a physical store and if that physical store is listed with Google Places, you can tell Google whether or not a particular item is available in that physical store.
- online_only is used to tell Google whether or not the item is available online only. Simply use a “y” to indicate that it may only be purchased via ecommerce or “n” to indicate that it is also available in a physical store.
Specifying Where Products Are Used
Google has two more fields that may be added to your spreadsheet data feed. These fields control where products appear and whether or not products listed in the data feed should ever expire.
- excluded_destination is used to tell Google not to submit the product information to one or more of its services. Accepted values are “Product Search,” “Product Ads,” or “Commerce Search.” Remember, specifying a service excludes it.
- expiration_date tells Google that a particular item should not be listed after the date indicated. The format for the date should be a four-digit year, two-digit month, and two-digit day, so that December 25, 2011 is “2011-12-25.”
In the Spreadsheet
Each of the descriptions above represents a column head in your product spreadsheet. Each row in the spreadsheet should represent a single product. Once the spreadsheet is completely filled out, you will need to save it as a tab-delimited text data file.
If you were working in Microsoft’s Excel, you may choose “Save as” from the File menu. In the Save as box, choose “Text (tab delimited). Then save. You may be asked to confirm.
Other spreadsheets — like Google Spreadsheets or LibreOffice Calc — have similar options for saving as a tab-delimited text file.
visit: https://support.google.com/merchants/answer/188494?hl=en#US for more info
To add accurate tracking parameters to each product URL they insert into their data feed.
Google has a cool tool which helps merchants figure out how to tag them:
Google Merchant Center Feeds Official Specifications:
- Products Feed Specification
- Summary of attribute requirements
- Categorize your products
- Unique product identifiers
- Tax & Shipping
- Submit apparel products