Inconsistent casing in expand field

[simontreanor]

Stripe has an optional "expand" field that takes a list of strings representing fields to expand, e.g. ["latest_charge"] on a payment intent retrieve request will expand the field from a simple payment-intent ID string to a full-blown payment intent object.

However, sometimes the "expand" field is a query-string parameter and sometimes it is a form parameter. In the former case it needs to be formatted as expand = ["latest_charge"] but in the latter case as expand = ["latestCharge"]. This is inconsistent behaviour and needs addressing but might break existing implementations.

[simontreanor]

let! customer = Customers.RetrieveOptions.New(customer = customerId, expand = ["default_source"]) |> Customers.Retrieve settings gives error An index satisfying the predicate was not found in the collection. in SeqModule.Find (FSharpFunc<T,Boolean> predicate, IEnumerable<T> source). Using defaultSource instead gives a Stripe error that the field cannot be expanded.