curl --location --request POST 'http://dev-cn.your-api-server.com/v2/business/content/linkedin-ad-descriptions?engine=economy&language=en&num_copies' \
--header 'content-type: application/json' \
--data-raw '{
"product_name": "string",
"product_description": "string",
"target_keywords": "string",
"promotion": "string"
}'
[
null
]