curl --request POST \
  --url https://api.fello.ai/public/v1/contact/{contactId}/tags \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "tags": [
    "SELLER",
    "HOT LEAD"
  ]
}'

{
  "tags": [
    "HOT LEAD"
  ]
}