Testing with the PayPal sandbox gateway

There are two options to test your PayPal online payment set-up. The easiest option is to make a booking on the live system and immediately reverse it. This will come at a small cost, as PayPal charges you a fee for the refund ($0.30/€0.35). If you want to avoid this charge or do more extensive testing, you can use the gateway in test mode in combination with a PayPal developer account.

Presuming you have not used the PayPal sandbox before, log in to developer.paypal.com, using your normal PayPal credentials
Go to Dashboard > Sandbox > Accounts. Here you will see that a Business test account has already been created for you. This account uses a (fake) email address that is modeled after your real email address, but with -facilitator appended to your username. For example, user@example.com would have become user-facilitator@example.com. Click this email address in the overview and click on the Profile link that appears below the email address. In the pop-up window that opens, select Change password, provide a password for this account and save it
Next, create at least one Personal test account, which can be used to make test payments
While remaining logged in to developer.paypal.com, log in as administrator to your SuperSaaS account in another browser window/tab
Go to Payment Setup and ensure the PayPal account is the one used in the Sandbox.
Check the box Test mode. Switch to the sandbox gateway.
Press Save changes
Log out as administrator and log in as a user
Make a booking that requires a payment. When you come to the PayPal site, log in using the credentials of one of the Personal test accounts that you created in step 3
You can now complete the payment process as if you were a real user. Upon completion, you’ll be taken back to your SuperSaaS schedule
Log out as user and log back in as administrator. When you now review the status of the test booking, you’ll see a + to indicate that payment was received
To inspect test payments you received in your facilitator account and/or test refunds, go to Applications > Sandbox accounts and select the Enter Sandbox site link, situated above the overview of your test accounts
Log in using the credentials of your facilitator account as created in step 1
On the overview tab, under My recent activity, you’ll see the payment listed that you received following the test booking. Please refer to Testing on the live system for more information on how to make a refund

Once you’re done testing, make sure you delete the “magic word” you added in step 5 (or replace it with your proper PayPal credentials, if necessary) and switch off test mode by unchecking Test mode. Switch to the sandbox gateway. on the Payment Setup page.