The reason for the credit. Provide the id or code: for invoices credit_memo_reason_refund, credit_memo_reason_overpayment, credit_memo_reason_return, credit_memo_reason_discount, credit_memo_reason_billing_error, credit_memo_reason_fee_adjustment, credit_memo_reason_service_not_provided, credit_memo_reason_dispute, or credit_memo_reason_other; for payables payable_adjustment_overbilling, payable_adjustment_duplicate, payable_adjustment_rebate, payable_adjustment_not_rendered, payable_adjustment_return, or payable_adjustment_other.

The bill's line items with the amount to credit per line. At least one line must have a payment greater than zero, and no line may be credited beyond its remaining balance.