Two great points. The amounts are actually integer, the same pattern used by Stripe and others. See it here: https://github.com/decimals/sequence/blob/master/src/decimal...

I'm working on enabling idempotent requests, should come out next week. I'm using the same pattern used by Stripe as well (big fan). An optional `x-request-id` header that will ensure only once processing if present. This is very important to enable consistency over the network with other services using the ledger.