https://www.giffgaff.com/super-recruiter currently says this:
How and when do I get paid the cash rewards?
We pay our Super Recruiters exclusively via PayPal, so if you don’t have a PayPal account you’ll need to set one up. And you’ll receive your reward payments on a monthly basis. We usually make payments around the middle of the month. If you don’t have a PayPal account, we’ll add the points to your giffgaff Payback account.
In the above, the first and final sentences are mutually contradictory. It’s not possible to pay “exclusively” by one method and then have a second method that is also used.
I’d suggest a minor amendment to remove the contradiction, something like:
We prefer to pay our Super Recruiters exclusively via PayPal, which allows us to pay your rewards every month. If you don’t want to set up a PayPal account, we will add the points to your giffgaff Payback account instead, so you will receive payments twice yearly (towards the end of June and December) rather than monthly.