Dynamics 365 Commerce: Under the Microsoft "Base and Attach" licensing model, core Dynamics 365 applications can be licensed as either a Base license (the first, highest-priced license) or an Attach license (a secondary, discounted license for users who already have a qualifying base license). As per the Base and Attach Licensing table, Commerce qualifies as both a base and an eligible attach license for users who already have Dynamics 365 Finance.

Power Apps: Power Apps is licensed via standalone per-user or per-app plans. Unlike Dynamics 365 apps, there is no "Attach" SKU for Power Apps that provides a discount for existing Dynamics 365 users. While Dynamics 365 licenses include "seeded" Power Apps use rights, any additional Power Apps licensing required for a quote is treated as a Base only license type.

Microsoft Dynamics 365 Licensing Guide (January 2025): Section "Dynamics 365 Licensing Overview" and "Base and Attach Licensing" (Appendix B), which defines qualifying base and attach options for Commerce and Finance.

Microsoft Power Platform Licensing Guide (January 2025): Section "Power Apps per user plan" and "Power Apps per app plan," detailing standalone licensing structures without "Attach" pricing.

Microsoft Learn: "Manage Dynamics 365 apps that run on Microsoft Dataverse" (December 2025). This explains the environment requirements for licensed first-party apps like Commerce. [Source ID: 4.4]

Finance & Operations Documentation: "Stay compliant with user licensing requirements" (January 2026), detailing the "base-then-attach" sequencing for Finance, SCM, and Commerce. [Source ID: 5.1]