sign-up
noun
ukus [ U ]
an occasion when you start doing or having something or start being a member of a group, especially by signing a document:
Instead of paying a sign-up fee, investors pay a fee based on the amount they invest.
The card recently was charging $20 at sign-up and $3.50 a month to use.
[ C ]
someone who starts to do or have something, for example someone who opens a bank account:
The bank has had hundreds of sign-ups for the new account.