post https://api-sandbox.pismolabs.io/rates/v1/exchange-rates
Define the exchange rate that the issuer will use for international transactions. This endpoint replaces Create exchange rates.
By default, the Pismo platform uses the org's daily exchange rate. You can use this endpoint to define today's or tomorrow's exchange rate. Optionally, you can define an exchange for a specific program, and the platform will use this rate and not the org rate for all program-related transactions.