On the Main / Primary Merchant Facility, there is a button about 1/3 of the way down. This is Recurring Payment Processor. Press STOP and that will pause the processor.
Similar spot to the Batch Processor in this FAQ: How do I start or stop the Batch Processor | Payments2Us - Frequently Asked Questions | Payments2Us Manuals
If restarting in say a few months, you may want to review the last payment date/next payment date. These may need to be manually updated. You may want to loop back to our support as you can either do catch ups (for the missed payments), or skip.