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The IMS Learning Design model defines how users are engaged in learning activities to use learning objects and learning services. Although these are similarly accessible from URLs in a learning design, they are essentially different in the form of accessing their features and operations from a learning activity user interface. This paper proposes a Representational State Transfer (ReST) architectural style of accessing a learning service and its constituent resources from a web-based environment. A methodology to guide the design of learning service access is also described. The method is applied to integrating operations of a generic wiki service in the client interface of a learning activity, and validated on actual wiki services providing ReST-based programming interfaces.