Uniform Commercial Code (UCC): Key sections include Article 9 (secured transactions), Article 2 (sale of goods), and Article 3 (negotiable instruments). UCC provides the fundamental framework for commercial transactions and assignments.

State-Specific Contract Laws: Individual state legislation governing contract formation, enforcement, and assignments, including state-specific Statute of Frauds requirements and assignment restrictions.

Federal Anti-Assignment Act: Federal legislation that restricts the assignment of claims against the United States government, particularly relevant if government contracts are involved.

Fair Debt Collection Practices Act: Federal law governing debt collection practices, must be considered if the assignment involves consumer debt or collection rights.

Federal Assignment of Claims Act: Specific federal legislation governing the assignment of claims in federal contracts and transactions with government entities.

Securities Laws: Federal and state securities regulations that may apply if the payment rights could be characterized as securities, including relevant SEC regulations.

Bankruptcy Code: Federal bankruptcy laws affecting assignment provisions and the treatment of assigned rights in bankruptcy proceedings.

Common Law Principles: Fundamental legal principles governing contract formation, consideration requirements, and notice obligations for assignments.

Consumer Protection Laws: Federal and state consumer protection regulations that may affect assignments involving consumer transactions or consumer rights.