Uniform Commercial Code (UCC): Key sections include Article 2 regarding sales of goods, Article 1-201(b)(36) defining rights and receipts, and requirements for written acknowledgments. Essential for governing commercial transactions and receipt documentation.

E-SIGN Act: Electronic Signatures in Global and National Commerce Act - governs electronic signatures and records, crucial if the receipt will be issued or stored in electronic format.

State Contract Laws: State-specific requirements for valid consideration, statute of frauds requirements, and receipt documentation requirements that vary by jurisdiction.

Record Keeping Requirements: Includes Internal Revenue Code requirements for business records, state tax authority requirements, and mandatory retention periods for documentation.

Consumer Protection Laws: Including Fair and Accurate Credit Transactions Act (FACTA) and state-specific consumer protection requirements, particularly relevant for consumer transactions.

Industry-Specific Regulations: Specialized requirements that may apply depending on the nature of goods/services and industry-specific regulatory frameworks.