curl --location '/smartflows//actions/website-widget' \
--header 'Authorization: Bearer JWT' \
--header 'Content-Type: application/json' \
--data '{
"name": "Custom activity name",
"ancestorId": "4a06896c-81b3-44f4-b493-2057bef951a2",
"cssSelector": ".product-recommendations",
"modifyType": "append"
}'{
"activityId": "string",
"name": "string",
"campaignUuid": "string",
"nextActivityType": "triggers"
}