Payment Not Completed But Went Through

Hello,

I ordered some pizza and used Apple Pay to check out. I tried checking out but it gave me an error that the payment couldn’t be completed. I tried again 3 more times just to see if it was a fluke or my connection was bad. The 4th time it did work. I went to the pizza place and they made all 4 of the pizzas and I checked my statement and it showed the 4 charges but the company only sent me 1 receipt.

Why would it do this? Is this an apple problem or a problem with the developer of the app? Any help is appreciated because I don’t want to encounter an embarrassing situation like that again!