We have to have phone auth through Firebase on our mobile apps for a project. But there will also be variants that will not have the said phone auth.
As there is a centralized API too, it would be best that the verification is initiated through it, instead of the apps. But I have not found any help towards that end in their docs.
If that's not possible, is there a way to verify said verification through the API or if there is some web-hook service available?