Hello @OCA212,
The issue was resolved as of approximately 11:20 PM ET last night, Feb. 7th. If you receive any further 500 responses past that point, please reach out to us via email, at webservices@constantcontact.com, with as much information as possible (the API key you're using, time stamps, example requests & responses, etc.), so that we can investigate.
Thank you again for your patience.
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