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
}'