Not sure about your situation specifically, but restaurants requiring a credit card during reservation is on the rise to combat reservation scalping and the no-shows that res scalping causes.

Here’s the list: https://en.wikipedia.org/wiki/Jus_soli#Unrestricted_jus_soli

If I’m counting correctly, 34 countries with unrestricted birthright citizenship, and 40 with restricted.

It’s available in the API and in some apps. I’m using Memmy for iOS right now and I get both.