After you subscribe the Fotor premium plan, there is a receipt generated in your Fotor account.
To download the receipt, please click the Avatar on the top right of the page and then click “My Account” to head over to your account page. 
Here you can see your “Payment History” and download the receipt. 
If you failed to download the receipt, please contact us at support@fotor.com or submit your request here: support.fotor.com.
In your email or message, you'd better provide your full name, account information, address and VAT number, and then we will send the receipt to you directly.