Render Dynamic Card From API

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Your question is Render Dynamic Card From API. Start with the requirements on the right.

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Problem

Implement a function that takes a JSON string returned by a mock API and converts it into a normalized card object with four required fields: heading, subheading, summary, and image. The input may contain extra fields, missing fields, or invalid JSON. Return the normalized object when valid, or null when the payload cannot produce a complete card.

Constraints

1 <= len(payload) <= 10^5
Input is a JSON string representing a single object
Required source fields are title, subtitle, description, and imageUrl
Ignore extra keys in the payload
Return null for invalid JSON or missing/empty required fields

Function Signature

def parse_card_payload(payload):

Your solutionPython 3

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