If I received letter to verify WH&DC credit, & I paid childcare provider cash, how do I prove payment I made w/out exact withdraw from my bank that day to match receipt?

My letter is requesting bank statements showing cash withdrawals for my payments made. I have matching dates for most of payments, but some I didn't necessarily withdraw the money and take it directly to pay my provider therefor I made payments but don't have a matching withdrawal on that exact date