Recurly
To connect to Recurly follow the steps below:
Log into https://app.recurly.com/login .

2. Go to “Integrations” and the “API Credentials”.

3. Copy the API key that is automatically generated or create a new one.

4. Enter the API Key under “username”. Under subdomain enter your subdomain EX. in “https://example.recurly.com/” the subdomain is “example”

That is all, You should now be connected to Recurly.