Which of the following is the object prefix for Refunds?

The object prefix for Refunds is "re_." In Stripe's API design, prefixes are used to clearly indicate the types of objects within the API, helping developers distinguish between different kinds of entities. The prefix "re_" signals that the object pertains to refunds, making it clear that this relates to the process of returning funds to a customer after a transaction has occurred.

This naming convention aids developers in quickly identifying the function and data associated with each object when interacting with the API. In this case, the other prefixes serve different purposes: "txn_" denotes transactions, "pm_" is related to payment methods, and "cus_" is used for customers. Each prefix reflects a distinct category within the Stripe ecosystem, ensuring that developers can easily navigate through the various components of Stripe’s API.