Thanks for joining in the thread, @Lucym18.

Let me share some information about creating a positive pay file. At this time, this feature isn't available in QuickBooks Enterprise. As mentioned by my colleague above this thread, you'll have to visit our QuickBooks Desktop Apps to check for a third-party application. 

Additionally, our Community Backers can recommend and assist you on how to create this using a third-party app. 

If you need anything else, do let me know. I'll be around to help. Have a nice day!