Update an offer template

curl -X PUT \
 /offer-templates/{id} \
 --header "Content-Type: application/json" \
 --header "Authorization: Bearer <token>" \
 --data '{
    "name": "",
    "sections": [
        ""
    ],
    "type": "section"
}'

{
  "id": "<string>",
  "name": "<string>",
  "sections": [
    "<string>"
  ],
  "type": "section"
}