I am working with a client that has a custom built app where customers can log in and update details. This app holds info such as email, name, custom tags on personal preferences and marketing permissions.
Is it possible to build an API call from a custom app into Klaviyo? I imagine the developers who built the app will need to install this, but first I wanted to know if this is feasible? And how I can support them.
Also is it possible to push opt-in / opt-outs back and forth via an API?
If someone could point me in the direction of the correct documentation to read and follow that would be great thanks.
Best answer by KeviSunshine
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