SAN FRANCISCO (Reuters) – "Neither a borrower nor a lender be" is a well-known warning from Shakespeare's "Hamlet." PayPal, eBay Inc.'s online payment service, heeded that advice for much of its existence, charging fees for processing transactions rather than lending money that may not be repaid. But Bill Me Later, one of eBay's fastest-growing businesses, is changing that. BML, as it's known …
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