title: Stripe payment service not Emailed customer automatically with created invoice using it's API
body: <p>I create invoice using stripe API (Java) and add argument billing as 'Send_invoice' and the invoice created fine, as documentation says this will email the customer with payment instructions but this not happen (the customer not Emailed automatically by created invoice), the invoice only sent to customer in case when manually click on send button of the invoice. this scenario happens in Test and Live mode, So please I don't understand what makes the customer not Emailed automatically when the invoice is created.</p>