Implementing matching in DiD

[FinStudent2021]

I am writing to request your help in identifying the matched pairs in the regression.

I have used Matchit package for matching after estimating propensity scores using CBPS package. My code is as follows;

mit.out<- matchit(tre ~ fitted(fit), method = "optimal",ratio=2, data = data2)
summary(mit.out)
final_matched <- match.data(mit.out)

Sample Sizes:
Control Treated
All 18412 2450
Matched 4900 2450
Unmatched 13512 0
Discarded 0 0

The matched dataset includes distance, weights and subclass. I am confused how to use the matched pairs in my DiD regression . Can you please refer me a webpage or a paper? Thank you.