Google Recaptcha

Allows admins to add a Google Recaptcha Secret key to verify a recaptcha response included in the Add Subscriber request

AddOrUpdate

• Adds a method to update a subscriber if they exist, or add them if they don't

Update Subscribers

• Adds a service method to update subscribers
• Adds a service method to check if a subscriber exists in a list
• Adds a service method dynamically create custom fields and custom fields options in Campaign Monitor