When should I create a bill and not a standard invoice?
* When you want the customer to choose the payment method
* When you want to prevent the expiration timer on the invoice from starting
In the case of a bill, the parameter 'price_currency' is not required, but you must pass `'type':'bill'`
Create a new invoice.
*This will create a bill for $134.00, payable in the currency of the customer's choosing.*