What characteristic distinguishes an official salary slip from one generated by a tool like Zoho's generator?

Answer

It must originate from the employer's verified system

An official salary slip must originate from the employer's verified payroll system, either as a digitally signed PDF from an authorized portal or a printed copy bearing official letterhead and stamp; generated slips carry no official weight.

What characteristic distinguishes an official salary slip from one generated by a tool like Zoho's generator?
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