Thank you all. I am now getting all mailing list IDs with one API call, and then calling each mailing list repeatedly to search matching recipient using multiple API calls. I can't ask the client to create a master mailing list. Anyway, aside from multiple API calls, it's working great. I might try to cache the data in our server to save API calls later.
Hi, Thanks for suggestion, but our client will not want to do that. They want to create specific surveys for specific mailing list.
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