After signing up and completing Stripe payment, I wasted time entering all my information for an email signature, only to be presented with this message, "missing_payment". I checked the My account section and see this message, "You have a pending payment. You will not be able to create any signature. " along with a "PAY NOW" button. Thinking that my payment didn't go through, I click the button and submit payment again. Nope. Still get pending payment message.
I found at least one label that isn't using English. An entry for Office phone will create this label in the email signature; "Oficina:"
I was willing to pay one month to use their service. But I regret it now. In the time I've spent trying to actually use their service I could have written the html myself.