How can I reorder payment gateway options in a custom build?

Shopify Apps
1

Hi guys, I’m trying to learn how i can use functions for building payment customization, for example i took this and build successfully https://shopify.dev/docs/apps/checkout/payments/getting-started where in this example is hiding the COD (cash on delivery) when the total amount is over 100, all good until here.
But i want to reorder for example COD to be first and then Gateway Payment with card to be the last one, how i can do that? I look into this: https://shopify.dev/docs/api/functions/reference/payment-customization where they mention about:

sort Sorts the payment options based on some criteria, typically to place one payment option at the top or bottom of a list MoveOperation Instead of sorting, you can move individual payment methods.

But i don’t know exactly where I suppose to put this this sort, what I’ve tried is to put the sort at return here is my example:

return {
    operations: [{
      sort: {
        index: -1,
        paymentMethodId: hidePaymentMethod.id
      },
      hide: {
        paymentMethodId: hidePaymentMethod.id
      }
    }]
  };

This is at the end when the condition is true and is hiding the COD payment but i want to change that from hiding to reorder.
Thanks!