Consumer Protection Act 1999: This act provides the fundamental framework for consumer rights in Malaysia, including the right to return goods and the procedures for such returns. It's essential for establishing the legal basis of the return authorization.

Contracts Act 1950: This governs the formation and enforcement of contracts in Malaysia. The authorization letter creates a contractual relationship between the parties involved, making this act relevant for ensuring the letter's validity.

Powers of Attorney Act 1949: While not directly a power of attorney, this act provides principles for authorization and agency relationships, which are relevant when one person authorizes another to act on their behalf.

Electronic Commerce Act 2006: If the authorization letter is to be transmitted or stored electronically, this act becomes relevant as it governs electronic transactions and documents.

Evidence Act 1950: This act is important as it governs what constitutes admissible evidence in Malaysian courts. The authorization letter needs to meet certain criteria to be legally valid and admissible as evidence if disputes arise.

Sale of Goods Act 1957: This act provides the legal framework for transactions involving goods, including provisions related to return of goods and transfer of ownership.