Where can I find an invoice or receipt for extra characters?
Check the email address used at purchase, including its spam folder, for a receipt or invoice. A payment receipt and an invoice are different documents. If you only received a receipt and need an invoice, or cannot find either, contact Support. Mention that the purchase was for extra characters and give the date and amount. You do not need to share a card number or security code.
If you have not bought the characters yet, eligible paid accounts can buy additional characters from account information. The plan comparison in Billing is for choosing a subscription; opening it does not buy characters. On mobile, the extra-character purchase button is shown only to subscribers. After purchasing, check the additional balance and proof of payment.