Is the membership recharge code risky?

This should still be safe. If it is a verification code for payment, it is not safe.

If he wants the verification code, you have to see what the verification code says, because before sending the verification code, he will write down what the verification code is used to say. If the verification code says it's for the payer, you can give it to him. If not, you must not give it, so you should read it carefully before deciding whether to give it or not.