Word Choice – Natural Ways to Say ‘I Am Getting Familiar with Something’

The two sentences that you present are entirely synonymous. In this case, there is no difference in their meaning, both connotatively as well as denotatively.

As Damkerng said in the comments, the best option in my opinion (and the most common in my experience) is

We accept credit cards.

The fact that the credit cards are used for payment doesn't need to be stated - it is implied, because that is the only thing you can use credit cards for.

If you want to avoid repeating "after something" you can use these variants:

• When the Post-Matches rules are obtained, the algorithm then performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• Once the Post-Matches rules are obtained, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• Having obtained the Post-Matches rules, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• As soon as the Post-Matches rules are obtained, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• The instant (moment,second) the Post-Matches rules are obtained, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

You can add a few more words:

• After having successfully obtained the Post-Matches rules, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• Immediately (directly, right, shortly, soon, just) after obtaining the Post-Matches rules, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.

• Subsequent to the obtaining of the Post-Matches rules, the algorithm performs the extraction command and the post-assignments of both Pre-Matches and Post-Matches.