Checking API for user Email and Subscribed lists

[dominik.steffen]

Hello guys,

i have created a custom form right now - which basically works great for subscribing. But i want to request on loading the form if the user is already subscribed to some lists so i can mark the correct list checkboxes as checked.

Unfortunately i currently cannot find the documentation regarding API calls. There surely is a php function or something else i can call to retrieve whether a user is subscribed to a list ID or not? Maybe you can point me to the correct documentation section?

Thanks a lot for your time in advance.

[Author]

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