2 answers 
You can pay by credit card, cash or electronic checking; besides, you can can pay by PAYPAL.
BESIDES is a connective/conjunction used in a compound sentence.
It is similar to IN ADDITION TO, FURTHERMORE, MOREOVER. Watch out your punctuation marks.
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answered Dec 16 '11 at 05:03
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Besides chemistry, I have been learning physics.
It means...
I have been learning physics in addition to chemistry.
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answered Dec 17 '11 at 07:46
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