Click that link to display the API credentials page.
Come back to this article and scroll down to the API Credentials section.
If you don't see a default application, click the Create App button. A new page will display.
Enter a unique name for the new API (e.g., Funnelish).
Click Create App. The API credentials page will display.
Come back to this article and scroll down to the this section.
Now back on Funnelish side..
On the PayPal API credentials page:
Click the Client ID field to copy the key.
Paste the key into the Client ID field.
Go back to the PayPal page.
Click the Show link (under the Secret heading) to expand the Secret folder.
Copy the key and paste it into the Secret field.
Click create gateway and save your changes!
Copy your client ID and Secret and paste them into Funnelish.
Check that you added your PayPal credentials correctly:
If doing test purchases: use your sandbox credentials and enable test mode.
If doing live purchases: use your real credentials.
In both cases, make sure that you copied the whole client id and secret key and pasted it without pressing the tab key or adding extra spaces.
UNCLAIMED PAYMENTS - If you get a notification about unclaimed payments, please make sure your account is verified and you have a valid business account with a verified email.