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is it corect if i say "please find the attached invoice as requested?
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Not quite, if you observe the logic. Use one of these:

Please find the invoice attached as requested.
Please find the requested invoice attached.
Please find attached the requested invoice.
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Are the wire details attached? or Is the wire details attached?

are

please find the attached invoices.

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I attached the requested invoice
I attached the requested invoice. The Simple Past tense means you attached it at some time in the past, eg yesterday, eg last year. It doesn't mean you are attaching it right now.

Clive