Referal fee

I was referred to Bulb by a friend. I used the link they sent me to register for bulb. However, nowhere on my application was there any section asking who referred me. How do they get their referal fee.

I was referred to Bulb by a friend. I used the link they sent me to register for bulb. However, nowhere on my application was there any section asking who referred me. How do they get their referal fee.

The referral link is unique to each person, so it is possible for Bulb to know which link you used when joining.