If you are getting errors from PayPal when testing (Sandbox mode) or in live mode, a couple of steps to take that could resolve it:
- Ensure there are no spaces before or after any of the API credentials you have entered
- If using ‘Sandbox’ mode for testing, you must have a Sandbox account at PayPal and you must use the Sandbox API credentials.
- The same goes for ‘Live’ mode. You must ensure you are using the API credentials from your main (or Live) account.
If problems still exists, go to Tools under the Sliced Invoices menu and download the System Info file and open a Support Ticket