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My case is simple, I want to have a custom object that keeps track of course subscriptions.
Don't assume anything is simple with COs.
Have you read Understanding Marketo Custom Objects in the docs?
Does anyone has a source where I could find input on how to write to a custom object?
I know you should have a webhook, but since I am not that technical I would like to have a guide to build the complete flow.
A webhook isn't necessary but a REST API client app is one of the 2 ways to update COs. And a Marketo webhook can call a service that in turn acts as a client app. Apps can also be standalone Java, JS, PHP, Ruby, whatever apps or even compiled Windows or Mac executables!
The other way to update COs is via a List Import in the Marketo IO. This seems to be a better choice for you. A developer must be enlisted to write connected apps, this is not something to muddle through.