Know-How Exchange : Taglines/Names

I am need to refresh my member referral program with a catchy tagline. Currently when members of a private club refer a prospect and they join the club, the member receives a $300 F&B credit to their account. What's happened with a previous sales person is that it became a "sponsor program" versus a "referral program". So a current member would say oh I sponsored so and so and you owe me a credit on my account. I want to change to make sure they understand it's a referral program and they only get the money if they give us the referral upfront and then they join! I like Sponsor a friend for a credit to spend, but that leaves me at this club in the corner because of the word sponsor instead of refer. We could use Refer a Friend for a Credit to Spend, but we'd need to be super clear that it's not the referral only, it's when they actually join. So I was just seeking some creative taglines.