If both exist, understand which applies where.
THE DIFFERENCE IN PURPOSE
A rewards programme typically returns value on your own spending with us. An affiliate programme typically pays commission for bringing new customers.
They can coexist, and the rules of each set out whether you may participate in both and whether the same referral can earn under both.
WHAT TO CHECK
Whether referrals fall under rewards, affiliate, or either Whether participating in one excludes the other Which pays more for a referral, if you have a choice
How each pays out: credit, cash, or something else
WHICH SUITS YOU
If you host with us and refer occasionally, rewards redeemed as credit against your own invoices is usually simplest. If you produce content and refer at volume, the affiliate programme is likely designed for that. If you host many client sites, reseller hosting may earn more than either.
DO NOT ASSUME
Read both sets of rules, or ask in a ticket. Referring people under an assumption about which programme applies is how people end up with nothing credited.