curl -X POST "https://hub.suprsend.com/{workspace_key}/broadcast" \
--header 'Authorization: Bearer __YOUR_API_KEY__' \
--header 'Content-Type: application/json' \
--data '{
"list_id": "_list_id_",
"template": "_template_slug_",
"notification_category": "transactional",
"data": {
"user_name": "John Doe",
"product_name": "Premium Plan"
}
}'