Currently, Mercado Pago only allows payments in the local currency. That is, the account created in Colombia only accepts payments in Colombian pesos (COP)
and from clients that have an account in the same country. See this FAQ for more information.
To connect your MercadoPago account to CheckoutJoy, you will need to create an Integration in your MercadoPago account.
This will allow CheckoutJoy to communicate with your MercadoPago account.