Newsletter Marketing

curl --request POST \
--url "https://api.theirstack.com/v1/companies/search" \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <api_key>" \
-d "{
  \"tech_filters\": {
    \"technology_category_slug_or\": [
      \"newsletter-marketing\"
    ]
  }
}"