You fund every slot up front. Unclaimed slots are refundable at any time by cancelling the offer.
The platform is taken from this link.
Only if the code is not already in the link. Both are public on-chain — anyone can read them before taking a slot, which is the point — and they share one 128-byte field, currently 0 bytes.
Your referral code is not a link, so name the platform's own domain.
Be specific. This is what an arbitrator reads if the claim is disputed.
Exactly what the referee receives.
How many people can claim this.
Time a referee has to submit proof after accepting.
After this, no new slots can be taken.