Delta feeds

If a previous feed object has contained a deltaToken property, the next feed request from Hello Retail will include this deltaToken. The shop platform should then generate a product feed that only contains the products that have changed since the feed that generated that token. This isn't a new feed URL but a parameter for your regular feed URL that modifies it to only return the changed products.

The use-case for the delta feed is to provide an efficient way to synchronize your product catalog changes with higher frequency — so instead of requesting your full feed every hour, we can request only the changes and do it every 10 minutes instead.

For even faster synchronization, you can choose to utilize the Hello Retail API to trigger a delta feed request every time you make a change - many platforms have event hooks that can be used for this. You can read about that here.

To incorporate the delta functionality, you need to do the following:

• You need to accept a request parameter called deltaToken when Hello Retail requests your feed. When you receive a deltaToken as a query string parameter to your feed, you should only return products that have changed since that delta token.
• You need to create a new deltaToken when your feed is requested. This deltaToken can be any string. As mentioned above, it will be sent back to you on the next request and you can return any changed products. For many platforms, it would make sense to return a timestamp since this would allow you to query your shop platform for products that have changed since that point in time.