Is there a way to post out the Entry ID of a submitted form to MailChimp? I need these to be into cross reference the two databases.
I would also be happy with a hidden field that would generate a sequential number that could then be sent to MailChimp.
The entry ID is not available until after the entry is created, and that's after the subscription has been sent to Mailchimp. You could include an ID of sorts in a hidden field with the gform_pre_render filter. You'd have to keep track of the last number and then assign the next number yourself. Or, you could use something unique like a unix timestamp, which would always be unique and always sequential and increasing.
Documentation: http://www.gravityhelp.com/documentation/page/Gform_pre_render
