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GameStop

’s mysterious financing letter underpinning its audacious $56 billion bid for eBay

is emerging as a central issue in the proposed takeover, as questions mount over whether the deal is actually financeable.

The video game retailer said it has lined up a $20 billion financing commitment from TD Securities, part of TD Bank. But a key condition attached to this letter could ultimately make or break the deal: the combined company would need to maintain an investment-grade credit profile, CNBC’s David Faber reported, citing people who have seen the document.