Electronic Transactions Act (ETA): Primary legislation governing electronic signatures, electronic records, and legal recognition of electronic documents. Ensures validity of electronic authorizations in Singapore.

Personal Data Protection Act (PDPA): Key legislation regulating the collection, use, and disclosure of personal data, ensuring proper consent requirements and protection of personal information in documentation.

Evidence Act: Legislation governing requirements for documentary evidence, including admissibility of documents in legal proceedings and authentication requirements.

Powers of Attorney Act: Legal framework defining scope and limitations of delegated authority, requirements for valid authorization, and rules regarding duration and termination of authority.

Common Law Principles: Fundamental legal principles covering agency law, contract formation requirements, and matters of representation and authority in Singapore's legal system.

Organization-Specific Requirements: Specific requirements set by the receiving organization or authority that need to be incorporated into the authorization letter.

Authorization Scope: Clear definition of the purpose, scope, and duration of the authorization to be included in the document.

Identity Verification: Requirements and procedures for verifying the identity of parties involved in the authorization process.

Notarization Requirements: Any applicable requirements for notarization or other forms of official authentication of the authorization letter.