Update CreateTransfer : deprecated + refactoring

[flodef]

Replaced deprecated method getRecentBlockhash by getLatestBlockhash Code refactoring in checkAccount()

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Name	Status	Preview	Updated
solana-pay	❌ Failed (Inspect)		Dec 18, 2022 at 2:55AM (UTC)
solana-pay-docs	✅ Ready (Inspect)	Visit Preview	Dec 18, 2022 at 2:55AM (UTC)

[flodef]

@jordansexton Any ETA on commit ?

[flodef]

The build failed because of the recent change in the folder structure (pos ==> examples/pos). But the file in itself is building correctly :-D

[flodef]

Thanks for this! The latestBlockhash change is good, and refactoring the account checks is a good idea, but doesn't go far enough yet.

Excellent comment. Thanks for all the explanation that were crystal clear. It's done.