Article 2B adopts the common law rule. Restatement enforces subject to eliminating refusal terms. Contract of adhesion analyses enforce, but scrutinize unconscionability. Article 2B allows enforceability of forms only if there was an opportunity to review the form and an affirmative assent to it. Cases do not require affirmative act.
Case law varies but many cases enforce post payment terms.
Article 2B enforces terms only if there is a right to a refund. Cases do not routinely require a refund. Article 2B requires refund. From publisher or retailer. Article 2B creates method for contract between end user and copyright owner.