API returns "Internal Server Error" message with status code 200 for invalid payload

[harshit-webkul]

Describe the bug
When sending an incorrect or invalid payload to the API, the response body correctly displays an error message such as:
"Internal server error"
However, the HTTP status code is still 200, which is incorrect.
The API should return a proper error status code (e.g., 400, 422, or 500) depending on the validation or server failure.

To Reproduce
Steps to reproduce the behavior:

1. Pass an invalid/wrong payload (selectedConfigurableOption: 15, which is not available).
2. Observe the response.

Expected behavior
API should return correct error status codes, such as:

• 400 → Bad Request
• 422 → Unprocessable Entity
• 500 → Internal Server Error (if it fails internally)
  The status code should match the error displayed in the response body.

Actual Result:
Response body shows "Internal server error".
Status code remains 200, which indicates success even though the request failed.

Screenshots
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