取引リスクスコアリング：計算式としきい値

score = Σ(score_delta of every matched rule)

if decline_threshold < 500 and score >= decline_threshold: status = DECLINED
else if score >= review_threshold: status = IN_REVIEW
else: status = APPROVED

{
  "txn_id": "tx-0002",
  "status": "IN_REVIEW",
  "score": 65,
  "rule_runs": [
    {
      "rule_title": "High-value outbound",
      "matched": true,
      "score_delta": 30,
      "severity": null,
      "status_target": null,
      "action_summary": "score +30"
    },
    {
      "rule_title": "High-risk jurisdiction counterparty",
      "matched": true,
      "score_delta": 35,
      "severity": "HIGH",
      "status_target": "IN_REVIEW",
      "action_summary": "score +35; add_tag:high_risk_country"
    }
  ]
}