How can I determine which stores are regarded as supermarkets for a rewards credit card?
Contact AmEx. They are the only ones who might have a current list.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How can I determine which stores are regarded as supermarkets for a rewards credit card?

### Response:
Contact AmEx. They are the only ones who might have a current list.