Subscription via function?

Hi, would it be possible to subscribe somebody via a function call? I use a event management tool to let users sign up for a event, during that sign up process they fill out a dedicated subscription form. Would it be possible to sign up from there to the subscription list? I do have a hook to start code … add_action('eme_insert_rsvp_action','do_my_stuff'); function do_my_stuff($booking) { .... } So I have access to the email, first name and last name etc. Cheers Joerg Hi Joerg, This feature is possible but we will test it at own end and check the feasibility. Your suggestion is perfect for doing a start. But, posting data from another form, we need to implement an exchange key, without it can’t possible. Exchange key will be used to protect from unwanted subscription and more secure. Thanks Excellent! Many thanks!