Store API updates

The Store API has a change for members who run their stores with their own tools:

• Bulk redirect calls with more than 50 rows now run in the background and return an id. Use that id to check whether the batch is queued, running, done or failed, so large batches no longer time out. Calls with 50 rows or fewer save at once, as before.
• Scripts and AI tools that call the store API with a valid API key are no longer refused because of their User-Agent.