Uniform Commercial Code: Key articles including Article 3 (Negotiable Instruments), Article 5 (Letters of Credit), and Article 9 (Secured Transactions) that govern commercial transactions and payment guarantees

Truth in Lending Act: Federal law requiring clear disclosure of lending terms and standardizing the manner in which costs associated with borrowing are calculated and disclosed

Fair Credit Reporting Act: Federal law regulating the collection, dissemination, and use of consumer credit information

Equal Credit Opportunity Act: Federal law that prohibits credit discrimination on the basis of race, color, religion, national origin, sex, marital status, age, or whether one receives public assistance

State Contract Laws: Specific state regulations governing contract formation, enforcement, and interpretation that vary by jurisdiction

State Consumer Protection Laws: State-specific regulations designed to protect consumers from unfair practices in guarantee and payment arrangements

Statute of Frauds: Legal requirement that certain contracts, including guarantees, must be in writing and signed to be enforceable

Statute of Limitations: Time limit within which legal action must be taken to enforce the guarantee payment

Bankruptcy Code: Federal laws affecting the treatment of guarantees in bankruptcy proceedings and the rights of guarantors and creditors

Federal Reserve Regulations: Banking regulations that may affect payment guarantees, particularly in terms of financial institution obligations and requirements