curl --request PUT \
  --url https://api.nango.dev/sync/update-connection-frequency \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "provider_config_key": "<string>",
  "connection_id": "<string>",
  "sync_name": "<string>",
  "sync_variant": "<string>",
  "frequency": "<string>"
}'

{
  "frequency": "<string>"
}