A pay in slip is what you fill in when you are putting money into your account. On it you will need to state the amount you are paying in and wether its in cash or cheque form. A withdrawal slip works exactly the same but instead of putting money in you are taking it out. A debit form is what you need to fill in to allow the bank to make regular payments on your behalf from your account. This might be to pay rent or other bills. A credit form is wwhat you need to fill in in order to apply for a credit card or a loan.