How to find an API key:
1. Log in to your GetResponse account.
2. My account -> Account Details -> API & OAuth -> Under 'My GetResponse API key' click on "copy" button.
3. Go back to StoreYa and paste an API key to required field.
How to disable the double opt-in confirmation message on required campaigns:
If you want to disable double opt-in confirmation message, please disable double opt-in for "API Subscriptions" on required campaign. You may use the following this tutorial for further assistance: