Beginning May 31, 2022 we will enforce the following limits for custom batch  methods in the Content API for Shopping:
  Maximum entries per request: 10,000 
  Maximum transfer size per request: 32Mb (The payload received from the client) 
 
We’re introducing these limits to enable the fair and stable use of Content API for Shopping. The limits will apply to the following endpoints:
After May 31, 2022, calls to any of these endpoints that exceed these limits will begin to fail with the following error:
Visit our batching guide  to learn more about methods for reducing your batch size. If you are looking for a reasonable batch size to implement, we recommend 1,000 entries per request  for each endpoint. Following this means you are unlikely to encounter the limits even if your batch size temporarily increases.Content API for Shopping forum .