A "Payment" operation refers to the transfer of funds from a customer to a merchant in exchange for goods or services. It is the core transaction process where money moves from the payer’s account (such as a bank account, credit card, or digital wallet) to the payee's (merchant's) account.

Key points about a Payment operation:

Initiation: It begins when the customer authorizes the payment, typically through a point-of-sale system, online payment gateway, or other payment methods.

Authorization: In some cases, the payment is first authorized, which means funds are reserved but not yet transferred. The actual transfer of money (capture) may happen later.

Settlement: Once the payment is authorized and captured (if needed), the transaction is settled, meaning the funds are moved to the merchant's account.

Completion: Upon successful payment, the customer receives the product or service, and the merchant receives the funds.

In summary, a payment operation is the fundamental process of transferring money from the customer to the merchant in exchange for goods or services, involving authorization, capture, and settlement.