purge_by_prefix

export EMAIL='YOUR_EMAIL'
export APIKEY='YOUR_APIKEY'
export ZONE_ID='YOUR_ZONE_ID'

# Purge by prefix
curl --request POST \
  --url https://api.cloudflare.com/client/v4/zones/$ZONE_ID/purge_cache \
  --header 'Content-Type: application/json' \
  --header "X-Auth-Email: $EMAIL" \
  --header "X-Auth-Key: $APIKEY" \
  --data '{
  "prefixes": [
    "example.com/png/image.png"
  ]
  }'