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I'm using this URL to subscribe a new person: http://mydomain.com/sendy/subscribe?list=hpvQNBTp7JBkKqkms3FxGfirstname.lastname@example.org&name=Hunter
And it doesn't seem to be going through. Any ideas?
You’re using HTTP ‘GET’, you need to use HTTP ‘POST’ to post the variable data into the API.
There are examples in the API docs for download, so that you can download the example scripts and explore them.