I had not heard of lenders paying points -- usually, they charge points, and the issue is whether the buyer pays them or the seller pays them.  Maybe what you mean is lender credits.  I did find this:

Lender credits work the same way as points, but in reverse. You pay a higher interest rate and the lender gives you money to offset your closing costs. When you receive lender credits, you pay less upfront, but you pay more over time with the higher interest rate.

Lender credits are calculated the same way as points, and may appear on lenders’ worksheets as negative points. For example, a lender credit of $1,000 on a $100,000 loan might be described as negative one point (because $1,000 is one percent of $100,000).

That $1,000 will appear as a negative number as part of the Lender Credits line item on page 2, Section J of your Loan Estimate or Closing Disclosure.  The lender credit offsets your closing costs and lowers the amount you have to pay at closing.