Credit card interest is an expensive way to build credit.
As long as you pay at least the minimum before payment is due, you get the longevity of active account in good standing. Paying interest does not raise a credit score. If you only paid half, interest charges are the average balance since date of purchase and stopping interest takes a couple of months and is a pain in the rump. Any credit score improvement by credit utilization level is temporary only. If you can afford it, your best long term action is paying statement balance in full.
If you are about to rent an apartment in the next three weeks or apply for credit in some way in the next few weeks, THEN you make a half size payment. The higher score on credit utilization percent is NOT permanent. Longevity of active account in good standing is permanent. Continue to use the card and pay each much as Statement Balance is normally the best plan as it costs no money and still raises your score.
PS - I have a score that hovers around 800. I made a large purchase and credit score was BEFORE I paid it without interest and my credit score dropped 18 points. The next month, after paying the bill without interest, my score went back up 18 points. Credit utilization level drops (or raises) score for the date they pull the score but has no long term affect.