Hello Mary,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
It looks like the account you are testing with may be an expired trial account. While a trial is active, it should have access to the segments tool.
More info about trial accounts here:
Constant Contact free trial https://knowledgebase.constantcontact.com/articles/KnowledgeBase/5549-constant-contact-free-trial
In order to test with segments via the API without creating a paid account or upgrading your existing trial account, you can just create a new trial account (which will be "active" for 30 days) using a different email address.
Please have a look and let us know if you have any other questions!
You can also reach our team directly/securely via email at webservices@constantcontact.com and reference case #33015905.
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