Securities and Futures Act (Cap. 289): Primary legislation governing securities, financial instruments, and their trading in Singapore. Relevant for determining if the promissory note qualifies as a security and associated regulatory requirements.

Companies Act (Cap. 50): Fundamental legislation governing corporate entities in Singapore, relevant for corporate authority to issue promissory notes and corporate governance requirements.

Bills of Exchange Act (Cap. 23): Legislation governing negotiable instruments including promissory notes, their form, content, and enforcement in Singapore.

Contracts Act (Cap. 53): Basic law governing contract formation and enforcement in Singapore, essential for the purchase agreement aspects.

MAS Securities and Futures Regulations: Regulatory framework by Monetary Authority of Singapore specifying detailed requirements for securities offerings and trading.

Anti-Money Laundering and Countering Financing of Terrorism Act: Legislation requiring due diligence and compliance measures to prevent money laundering and terrorism financing.

Stamp Duties Act: Legislation governing stamp duty requirements for legal documents and financial instruments in Singapore.

Personal Data Protection Act: Law governing the collection, use, and disclosure of personal data in Singapore, relevant for handling parties' information.

Income Tax Act: Tax legislation relevant for understanding tax implications of promissory note transactions and related income.

MAS Guidelines on Offerings of Investments: Regulatory guidelines providing specific requirements and best practices for investment offerings in Singapore.