Wrong type for amount field -> PaymentCreateRequest

[Arthurmtro]

gocardless-nodejs/src/services/paymentService.ts

Line 17 in 3b46dfe

amount: string;

In the documentation we can see that the field is a number but in the package it's a string
who is wrong ^^

https://developer.gocardless.com/direct-debit/taking-a-one-off-payment