Thank you for your interest in recurring payments, John.
Yes, there are other ways to complete the authorization form. You can print it and complete in information in the Merchant sections. Then, send it to your customer by mail, fax, or hand it to them in person.
Please check out more details in this article: Get authorization for a recurring charge.
You can also check out the Recurring Credit Card Payment FAQs for your additional reference.
Feel free to go back to this thread if you have more questions about the form.