Use this method to get a list of all segments associated with the account.
You can sort segment results and limit the number of segments that display
per page. Deleted segments are excluded from the results. For more use
case information, see Get All Segments
in the API guide.

Use this method to create a new segment. You create segments to target
a subset of your contacts that meet your specific criteria for a marketing
campaign. The segment name must be unique. The segment_criteria
requires single-string escaped JSON. Constant Contact uses the contact
data that you specify in the segment_criteria to evaluate and identify
the contacts you want to target. Contact data can be grouped from different
data sources, including:

• tracking: Supports or and and groups.

• contact: Supports or and and groups.

• list_membership: Supports or groups.

• tags: Supports or groups.

If you do not specify list_membership as criteria, Constant Contact
evaluates all contacts in your account. To avoid returning a 400 error
response, when specifying the segment_criteria do not request more
than 500 email campaigns or a date range greater than 1825 days (5 years)
be evaluated.

For more use case information, see the Segments Overview
in the API guide.