username:passwordAuthorization: Basic *****************curl --location --request POST 'https://api.socialidnow.com/v1/marketing/login/users//mpact_client_ids' \
--header 'Authorization: Basic <encoded-value>' \
--header 'Content-Type: application/json' \
--data-raw '{
"mpact_client_id": "string"
}'{
"id": 0,
"mpact_client_id": "string",
"user_id": 0,
"created_at": "2019-08-24T14:15:22.123Z"
}