If you are having trouble connecting with Zapier, it might be due to a mismatch of data. If the authentication failed, please make sure you are inputting the right data.
Please remember that your Zapier username is your Donorbox login email and your password is your API key. If you don't have an API key yet, you can enable it here.
Please note that API & Zapier integration has a cost of $17/month.