How do I get paid for the sales my website is driving?

You're going to receive a monthly payment through the Paypal account you've linked to the platform, or direct debit if provided.
Note that payments only start occurring once you have accrued the earnings threshold of USD50, and in months when the threshold is met.

Payments can be USD, EUR, AUD, CAD, GBP depending on your account's currency.

Good On You pays you commission on sales two months after the orders took place. That allows brands to always have a minimum of 30 days to register returns and refunds, and to pay their credit for any registered sales.

We're not charging commissions on orders that have been returned for >50% of their total value, so you won't receive any payments for those sales either. 
Also note that, as stated in the T&Cs (5.3), payment is dependent upon brands providing funds to Good On You in relation to each referred sale, so you will only receive your payment if and when the brands have paid their credit in the first place.