Build LicenseSeat Licensing Into a Swift App

Wire the LicenseSeat licensing platform (licenseseat/licenseseat-swift) into a macOS/Swift app correctly. The SDK's real API differs from its own README in ways that fail to compile or silently misbehave, and several traps compile clean and only surface at runtime. This skill carries the source-verified surface (v0.4.1) plus an integration blueprint hardened by a shipped macOS app that went through four adversarial review rounds (~25 findings).

When to use

• "Add licensing / license keys to this Mac app", "integrate LicenseSeat"
• Writing or changing any call against the LicenseSeat Swift SDK
• Activation/deactivation UI, trials, entitlement gating, seat management
• Debugging licensing behavior (activation "fails", status stuck, offline weirdness)
• Reviewing a licensing diff

When NOT to use

• App Store IAP / StoreKit — different distribution model entirely
• Other license vendors (Polar, Paddle, Keygen, Lemon Squeezy, Gumroad's native keys) — the anti-pattern evidence in references/pitfalls.md transfers, the API surface does not
• Pricing strategy / packaging decisions

Critical facts (read before writing any code)