The most common and most likely answer to this crossword clue is the 4 plus 3 plus 3 letter word CHIP AND PIN
I've seen this crossword clue in The Times
C
H
I
P
A
N
D
P
I
N
Buddy explains!
The straight part
We know that "Method of authorising payment/terms of golf" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case method of authorising payment/terms of golf = chip and pin.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.