Handle when * `Donation_Amount < 1` (i.e. handle Stripe returning error code [400: parameter_invalid_integer](https://stripe.com/docs/error-codes#parameter-invalid-integer)) * `Donation_Amount > 9999999` (i.e. handle Stripe returning error code [400: amount_too_large](https://stripe.com/docs/error-codes#amount-too-large)