Across major payment processors and subscription management systems like Stripe and through most of the stack, integers are used to represent how much to charge in the smallest currency unit. [1]

With that said, it's better not to reinvent the wheel here and follow the flow, and it's also the safer option— it's better to charge a customer $10 when you meant to charge them $1000, than it is to charge them $1000 when you meant to charge them $10.

[1] https://stripe.com/docs/api/charges/object#charge_object-amo...