Has anyone imported a large number of Single-Pay Vendors?

We need to be able to import a large data file from a vendor payments for a refund.  The checks will need to be distributed as soon as possible after January 1, 2018.  The preliminary estimate is that there may be 4,000 checks/vouchers.  Once the payees and amounts are determine our plan is to use PeopleSoft Accounts Payable to cut the checks. If anyone has created a customization to get this task accomplished (and would be willing to share) or to ideas, it would be greatly appreciated.