The companies publish their lists of cryptocurrency purchase vendor sites to their SEC EDGAR files in these memos:
https://drive.google.com/file/d/1xexQRIQ9TDjRShV-mn2grK7RPCNvo9jE/view?usp=sharing
https://drive.google.com/file/d/1oeZWQwdjQ_hgZB7nQ8LcV3bs7MSci8xO/view?usp=sharing
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