Manually sync subscribers

Fixes

1. Agency – Aut0-assign custom apps to clients: Now when you assign custom domains to clients, custom apps that are linked to that domain will be used as default social apps for the clients.
2. Connections: fix API connections to these services:
   • Aweber
   • Mailchimp
   • Getresponse

New Features

1. Manually sync subscribers: Use this button to manually sync all your contacts of an opt-in URL to your data sync integration. (Useful when API connection has error).