At first it looks like the API output has changed and the program cannot deal correctly with the output. After executing the program, it fails with this error message:

 Traceback (most recent call last):
  File "/x/rewe_discounts", line 193, in <module>
    categories = data['_meta']['categories']
 KeyError: '_meta'

However the API url (https://mobile-api.rewe.de/products/offer-search) yields a 500 error, which looks like an internal error of the rewe api. Not sure if I can fix this:

errorReason: "status - 500 by calling Endpoint Service, because of reason: result.data.map is not a function}"