1. In determining the true nature of a contractual relationship, courts must examine the express provisions of the agreement as a whole. Where a party claims to be an agent but the agreement provides that the party sources its own customers, decides credit terms, and carries the risk of default without privity of contract between the principal and end-customers, the relationship is one of independent contractor, not agency. 2. The parol evidence (integration) rule prohibits extrinsic evidence from negating express and clear terms of an agreement, particularly where the agreement contains an entire contract clause and requires variations to be in writing and signed by both parties. 3. A plea of supervening impossibility requires demonstration of objective and absolute impossibility, not merely subjective or relative inability to perform. Economic difficulties, currency regime changes, and customer defaults do not constitute objective supervening impossibility. 4. For summary judgment purposes, a defendant must proffer a bona fide and plausible defense; defenses that fly in the face of express contractual terms and cannot be substantiated will not defeat summary judgment.