Uniform Commercial Code (UCC): Primary source of commercial contract law in the US, governing sales and business transactions between parties

State Contract Laws: State-specific regulations governing contract formation, enforcement, and interpretation

Statute of Frauds: Legal requirement that certain contracts must be in writing to be enforceable

Truth in Lending Act: Federal law requiring disclosure of key terms and costs in consumer credit transactions

Electronic Funds Transfer Act: Federal law governing electronic payment services and protecting consumers in electronic fund transfers

Fair Credit Billing Act: Law protecting consumers from unfair billing practices and providing dispute resolution procedures

Bank Secrecy Act: Federal law requiring financial institutions to assist government agencies in detecting and preventing money laundering

Anti-Money Laundering Regulations: Set of procedures and requirements designed to prevent and detect money laundering activities

PCI DSS: Payment Card Industry Data Security Standard requirements for organizations that handle credit card payments

Internal Revenue Code: Federal tax laws and requirements affecting payment documentation and reporting

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

Form 1099 Requirements: IRS reporting requirements for certain types of payments made in the course of business

Gramm-Leach-Bliley Act: Federal law requiring financial institutions to explain their information-sharing practices and protect sensitive data

State Data Protection Laws: State-specific requirements for protecting personal and financial information in business transactions

Industry-Specific Regulations: Additional regulatory requirements specific to particular industries (healthcare, construction, etc.)

Statute of Limitations: State-specific time limits for bringing legal actions related to contract enforcement