How do I check if a specific respondent email appears in the responses of a specific survey using the Qualtrics API?

I don’t think you can do this directly. My best guess would be a search directory contacts call with an email filter to retrieve the contactId and then a contact history call. Parse the result to see if you get a response with your surveyId.

Qualtrics API check if Respondent (email) has completed survey

Qualtrics API check if Respondent (email) has completed survey | Experience Community

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