Better error message handle

[Alexise857]

When adding a new tax, backend response the following:
message: "Validation error: code=400, message=Unmarshal type error: expected=float64, got=string, field=percentage, offset=46, internal=json: cannot unmarshal string into Go struct field TaxCreateRequest.percentage of type float64"
type: "invalid_request_error"

Steps to reproduce:
location_ids: ["loc_YwJ0zmuFcOwCrj"]
name: "test"
percentage: "15"

A better descriptive error will be better