curl --request POST \
--url https://YOURSITE.konstant.ly/openapi/v1/courses/123/assignments \
--header 'X-API-KEY: 1qaz2wsx3edc4rfv1qaz2wsx3edc4rfv' \
--header 'Content-Type: application/json' \
--data '{
"users": [1, 2, 3],
"groups": [4, 5],
"assignAt": 1676937600,
"deadlineAt": 1677024000
}'

{
    "users": [
{
    "id": "1234567890",
    "name": "John Doe",
    "email": "john@example.com",
    "role": {
    "alias": "learner"
}
}
    ],
    "groups": [
{
    "id": 4,
    "name": "Sales Team",
    "usersCount": 10,
    "coursesCount": 5
}
    ]
}