And when users pay for Consumable and Subscription products for the first time, is there no problem to verify them using Get Transaction Info Endpoint rather than Get Transaction History Endpoint??

I enjoyed the video you told me. Thank you very much. But I have one question. When I made a request using Get Transaction History Endpoint, I received a single Transaction ID as a parameter, so of course I knew JWT corresponding to that Transaction ID. However, I made a request by entering the Transaction ID 'A' as a parameter, but the JWT returned also contains information corresponding to the Transaction ID that was not entered as a parameter such as 'B' or 'C'. Why did you do that?