Hi there, danh2osoclean.
If you're subscribed to Mobile Payments, you can log in to your account and cancel it from there. Here's how:
If you can't see this option and have not processed transactions in the last 90 days, follow these steps to cancel your Merchant account:
Fax: 866 390-0010
Mail: QuickBooks Payments
Attn: Customer Retention
21215 Burbank Blvd.
Woodland Hills, CA 91367
If you've processed transactions in the past 90 days, please call our QuickBooks Payments Department. They will verify your account information and process the cancellation for you.
To get their contact information, open this link and look for QuickBooks Payments: https://community.intuit.com/browse/payments-contact-us.
Visit us again in the Community if you have other questions.