Uniform Commercial Code (UCC): Key federal commercial regulations including Article 2 (Sales), Article 3 (Negotiable Instruments), and Article 4 (Bank Deposits and Collections) that govern commercial transactions and payments

Truth in Lending Act: Federal law that requires lenders to provide standardized information about credit terms and costs, particularly relevant if the payment confirmation involves consumer credit

Electronic Funds Transfer Act: Federal legislation governing electronic payment transactions and transfers between financial institutions and consumers

Fair Debt Collection Practices Act: Federal law that regulates debt collection practices and protects debtors from abusive collection practices

State Contract Laws: State-specific regulations governing contract formation, enforcement, statute of limitations, and payment procedures

E-SIGN Act: Federal law ensuring the legal validity of electronic signatures and electronic documents in commerce

Uniform Electronic Transactions Act (UETA): State-level legislation providing uniform rules for electronic transactions and signatures

Internal Revenue Code: Federal tax regulations specifying documentation requirements for payment transactions and record-keeping

State Tax Regulations: State-specific tax rules affecting payment documentation and reporting requirements

Business Documentation Requirements: State and federal regulations governing business record keeping and documentation retention periods

Consumer Protection Laws: Federal and state regulations designed to protect consumer rights in payment transactions and business dealings