We do not collect any information about your identity. We do not know who you are, and we do not want to know.
We do not collect any information  regarding your specific credit card. We will NEVER ask you for your credit card information (nothing! we do not need or care about your banking information).
All we need is your credit card type (which means: the country it was issued at, the brand, the creditor, and the card name). 

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We store the app information in 3 different places: your device, your iCloud Drive account, and our servers.
On your device we maintain subscription information and a few configurations (such as if you opened the app ever before).
On your iCloud Drive account we store which credit cards you own and a few other configurations that we want to be updated across all the devices you have.

On our servers we store a proof of subscriptions purchases, and logging data for being able to provide better service in the case of error.
 

If you purchased subscription, the processing of the subscription is conducted by Apple or Google. We do not get any information regarding your payments, but only an electronic confirmation you have paid. 
We save this data only if the provider of this electronic confirmation reports to us this data have been tampered with (we cross validate all subscriptions with the provider).

We do not send any information regarding your location to our server. 
We do send the address of  the business you are at to our server. This information is used to validate business specific expected rewards (for example, in some cases specific branches of chains provide different amount of rewards).

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Your location is shared with Google services (this data is used for Google Ads mainly), and the Google privacy policy applies to that data. 
We do not share data we store  with Google (in other words, Google does not know which credit cards you have through us).
We use Google API to track app crashes and other bugs and weird behaviors.