PL-400 Question #29: Real Exam Question with Answer & Explanation

Question

A company uses five different shipping companies to deliver products to customers. Each shipping company has a separate service that quotes delivery fees for destination addresses. You need to design a custom connector that retrieves the shipping fees from all the shipping companies by using their APIs. Which three elements should you define for the custom connector? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.

Options

• AAuthentication model
• BAddress parameter
• COpenAPI definition
• DFee parameter
• EFee reference

Explanation

Building a custom connector requires three foundational elements: an OpenAPI definition (C) to formally describe the APIs you're connecting to (endpoints, operations, request/response shapes); an Authentication model (A) to specify how the connector secures its calls to each shipping company's API (API key, OAuth, etc.); and an Address parameter (B) because the destination address is the input you send to the API to receive a quote in return.

Why D (Fee parameter) is wrong: The fee is the response/output returned by the shipping company's API - it's what you receive, not something you define as a parameter you send. You don't pass the fee to the API; the API gives it back to you.

Why E (Fee reference) is wrong: "Fee reference" is not a recognized element in custom connector design (OpenAPI/Power Platform). It has no standard meaning in this context and is a distractor meant to confuse with terminology that sounds plausible.

Memory tip: Think of the three correct answers as covering the three questions every connector must answer - "Who are you?" (Authentication), "What do you want?" (Address parameter as input), and "How does the whole thing work?" (OpenAPI definition as the blueprint). If something is a result you receive back, it belongs to the response, not the connector's definition.

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