There aren't "NATO payments" per se.

However, it is a common defense treaty, and as such each member is expected to contribute a proportionate amount to their own military. Most recently the agreed level was 2% of GDP, which Germany has consistently fallen short of. Both Obama and Bush complained about it as well, but they both had a reasonable understanding of how things worked.

Who is receiving those NATO payments?

No it is not.

Germany is not delinquent on NATO payments, at least not on the formally agreed-upon budget contribution of 313 million € (https://www.dw.com/en/germany-to-match-us-contribution-to-na...).

The thing you (and Trump) are meaning is the total defense spending as percentage of GDP. Germany cannot be "delinquent" here by definition! Every country is legally free to spend whatever it wants on defense. The "2%"is an informal goal only, not backed by any international treaty!

AFAIK there are no "NATO payments". There's just an expectation that NATO countries will spend 2% of GDP on defense, and most European countries are far behind that. Germany however has increased its spending in recent years and is getting closer to the mark.

Trump just doesn't understand the geostrategic position of the U.S., where troops stationed in critical countries prevent invasions which would upturn its imperial economic order. Trump thinks the U.S. has stationed troops in SK, Germany, Taiwan for the countries' interests, where they were clearly deployed there to defend its own.