If you pay back Paypal Credit over 12 months at 17.9% p.a early, Do you pay FULL 12 month interested or just the time you have had credit?

Posted 4th Mar 2017
I was wondering IF I paid back the full amount within 4 moths, would I also payback the FULL 12 months interested or just that of 4?

Any Advice is appropriated.?
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