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PDPA 2012: Singapore's Personal Data Protection Act governs the collection, use, and disclosure of personal data. For billing address authorization, it requires proper handling of sensitive information, consent mechanisms for data sharing, and inclusion of privacy protection clauses.

Electronic Transactions Act: Provides legal framework for electronic documents and signatures. Relevant when authorization letter is handled electronically, ensuring legal recognition and validity of electronic documents and signatures.

Contract Law: Based on Common Law principles, requires essential elements of valid contracts including clear authorization statements, party details, mutual consent, and defined scope and duration of authorization.

Postal Services Act: Governs postal service requirements including proper address formatting and postal code verification for billing addresses within Singapore.

Financial Regulatory Requirements: Includes MAS guidelines, Anti-Money Laundering considerations, and Know Your Customer (KYC) requirements where applicable for billing address verification and financial transactions.