Debtor: The party that owes money
Creditor: The party to whom money is owing
Debit: An amount of money being removed
Credit: An amount of money being added
Let's apply the above to common contexts within Zepto.
Payment
The payment initiator is the debtor and will have a debit applied to their account.
The payment recipient is the creditor and will have a credit applied to their account.
Payment Request
The initiator of the payment request is the creditor and will have a credit applied to their account.
The payer of the payment request is the debtor and will have a debit applied to their account.
Refund
The refund initiator is the debtor and will have a debit applied to their account.
The refund recipient is the creditor and will have a credit applied to their account.