How to delete a contact from particular list via rest api

[user721369]

i want to delete single contact from particular list not to delete that contact from all the list

POST   https://api.cc.email/v3/activities/contact_delete

Body

{
"contact_ids": [
"contactid"
],
"list_ids": [
"listid"
]
}

Response error

[ { "error_key": "contacts.api.bad_request", "error_message": "contact_ids, list_ids are mutually exclusive" } ]

[Courtney_E]

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.

The Post /activities/contact_delete endpoint in your example is used to to bulk delete contacts from an account. Deleting a contact this way will strip all list memberships and remove the contact from the UI.

Here are two ways to remove specific contact(s) from specific list(s):

Option 1.)

Use the /activities/remove_list_memberships endpoint to remove an array of specific contact_ids from specific list_ids

Remove Contacts from Lists Bulk Activity
https://v3.developer.constantcontact.com/api_guide/remove_list_membership.html

Option 2.)
Step A: 

First, run GET /contacts to retrieve the existing contact info for the contact(s) you would like to update

GET Contact Data
https://v3.developer.constantcontact.com/api_guide/contacts_overview.html#search-for-contacts

Step B:

Then, edit the contacts’ data (in this case, remove the list_ids that you don’t want them on) and send the data back with PUT /contacts/{contact_id} to update the existing contact with the new submission information. When you update a contact using a PUT, all properties are updated, overwriting all existing property values. Any properties left blank or not included in the PUT will be overwritten with a null value.

PUT (update) a Contact

https://v3.developer.constantcontact.com/api_reference/index.html#!/Contacts/putContact

Please have a look and let us know if you have any other questions!