Check a representative's power to transact
Identify the legal owner and the person who will sign, receive funds or give instructions. If a representative is involved, obtain an authentic or independently verifiable mandate and examine its scope, subject property, validity and any limits on payment collection or substitution. Check the correct document with the competent professional or authority immediately before signing. Keep separate evidence of identity, signature authority and beneficial payment destination; none should be inferred from the others.
Practical verification checklist
Authority checks: Verify the seller's identity and legal capacity, and inspect the original or independently verifiable power of attorney where a representative signs. Confirm that its scope covers the specific property and transaction, and check validity and revocation through the appropriate channel. Arrange an independent translation when needed and never transfer money solely on the basis of a scanned authorization.

