I got a cashtoken reward from Momo and I was given a senders code without a receiver code

Hi Isaac, you do not need receiver code to withdrawal cashtoken, also, CashToken cannot be withdrawn; however, it enables you to participate in the CashToken Draw, if you win, it will be credited in your wallet which you can withdraw. You also get a cash back of 12% on every CashToken you receive.
Recipients of CashToken receive a guaranteed 12% cashback on every gifted CashToken. This means N6 for 1 CashToken; N12 for 2 CashTokens
You can check your cashback via your Y’ello win wallet. You can activate your wallet by creating a PIN via *6700# USSD menu