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LAGO_URL="https://api.getlago.com"
API_KEY="__YOUR_API_KEY__"

curl --location --request POST "$LAGO_URL/api/v1/events/estimate_fees" \
--header "Authorization: Bearer $API_KEY" \
--header 'Content-Type: application/json' \
--data-raw '{
      "event": {
          "external_subscription_id": "__YOUR_SUBSCRIPTION_ID__",
          "code": "__BILLABLE_METRIC_CODE__",
          "properties": {
            "custom_field": 12,
          }
      }
  }'