stripe payment　linksでメールアドレスを再利用したい。

前提・実現したいこと

stripe payment　linksでメールアドレスを再利用したい。
stripe payment links（test mode）とweb hooksを組み合わせてサンクスメールを送りたいと思い作成していたのですが、メールアドレスの取得がうまくいかないため質問させていただきました。(phpで作成)

発生している問題・エラーメッセージ

エンドポイントへのリクエスト
{
  "id": "evt_1JIa2SGU7ZsU0u3YLMWOtWuF",
  "object": "event",
  "api_version": "2020-08-27",
  "created": 1627568202,
  "data": {
    "object": {
      "id": "pi_1JIa2PGU7ZsU0u3YzeelbxNX",
      "object": "payment_intent",
      "amount": 1000000,
      "amount_capturable": 0,
      "amount_received": 1000000,
      "application": null,
      "application_fee_amount": null,
      "canceled_at": null,
      "cancellation_reason": null,
      "capture_method": "automatic",
      "charges": {
        "object": "list",
        "data": [
          {
            "id": "ch_1JIa2PGU7ZsU0u3Ygh3WojNd",
            "object": "charge",
            "amount": 1000000,
            "amount_captured": 1000000,
            "amount_refunded": 0,
            "application": null,
            "application_fee": null,
            "application_fee_amount": null,
            "balance_transaction": "txn_1JIa2QGU7ZsU0u3YlsTOyDlB",
            "billing_details": {
              "address": {
                "city": null,
                "country": "JP",
                "line1": null,
                "line2": null,
                "postal_code": null,
                "state": null
              },
              "email": "g122p938rh@gmail.com",
              "name": "test",
              "phone": null
            },
            "calculated_statement_descriptor": "WWW.SAKAKENBLOG.NET",
            "captured": true,
            "created": 1627568201,
            "currency": "jpy",
            "customer": "cus_JwSyGgIL9Where",
            "description": "Subscription creation",
            "destination": null,
            "dispute": null,
            "disputed": false,
            "failure_code": null,
            "failure_message": null,
            "fraud_details": {
            },
            "invoice": "in_1JIa2PGU7ZsU0u3Y9iHzEeLH",
            "livemode": false,
            "metadata": {
            },
            "on_behalf_of": null,
            "order": null,
            "outcome": {
              "network_status": "approved_by_network",
              "reason": null,
              "risk_level": "normal",
              "risk_score": 55,
              "seller_message": "Payment complete.",
              "type": "authorized"
            },
            "paid": true,
            "payment_intent": "pi_1JIa2PGU7ZsU0u3YzeelbxNX",
            "payment_method": "pm_1JIa2OGU7ZsU0u3Y2EwFtV4L",
            "payment_method_details": {
              "card": {
                "brand": "visa",
                "checks": {
                  "address_line1_check": null,
                  "address_postal_code_check": null,
                  "cvc_check": "pass"
                },
                "country": "US",
                "exp_month": 2,
                "exp_year": 2022,
                "fingerprint": "si1uii0mKt6jC17U",
                "funding": "credit",
                "installments": null,
                "last4": "4242",
                "network": "visa",
                "three_d_secure": null,
                "wallet": null
              },
              "type": "card"
            },
            "receipt_email": null,
            "receipt_number": null,
            "receipt_url": "https://pay.stripe.com/receipts/acct_1J9lj4GU7ZsU0u3Y/ch_1JIa2PGU7ZsU0u3Ygh3WojNd/rcpt_JwSyrZ7rUyHdItkjpKoaDVLutSZzhVH",
            "refunded": false,
            "refunds": {
              "object": "list",
              "data": [
              ],
              "has_more": false,
              "total_count": 0,
              "url": "/v1/charges/ch_1JIa2PGU7ZsU0u3Ygh3WojNd/refunds"
            },
            "review": null,
            "shipping": null,
            "source": null,
            "source_transfer": null,
            "statement_descriptor": null,
            "statement_descriptor_suffix": null,
            "status": "succeeded",
            "transfer_data": null,
            "transfer_group": null
          }
        ],
        "has_more": false,
        "total_count": 1,
        "url": "/v1/charges?payment_intent=pi_1JIa2PGU7ZsU0u3YzeelbxNX"
      },
      "client_secret": "pi_1JIa2PGU7ZsU0u3YzeelbxNX_secret_dHEFUO1w22Y0tc6pRFqsJkRU6",
      "confirmation_method": "automatic",
      "created": 1627568201,
      "currency": "jpy",
      "customer": "cus_JwSyGgIL9Where",
      "description": "Subscription creation",
      "invoice": "in_1JIa2PGU7ZsU0u3Y9iHzEeLH",
      "last_payment_error": null,
      "livemode": false,
      "metadata": {
      },
      "next_action": null,
      "on_behalf_of": null,
      "payment_method": "pm_1JIa2OGU7ZsU0u3Y2EwFtV4L",
      "payment_method_options": {
        "card": {
          "installments": null,
          "network": null,
          "request_three_d_secure": "automatic"
        }
      },
      "payment_method_types": [
        "card"
      ],
      "receipt_email": null,
      "review": null,
      "setup_future_usage": "off_session",
      "shipping": null,
      "source": null,
      "statement_descriptor": null,
      "statement_descriptor_suffix": null,
      "status": "succeeded",
      "transfer_data": null,
      "transfer_group": null
    }
  },
  "livemode": false,
  "pending_webhooks": 1,
  "request": {
    "id": "req_2EYtPpHftZAocb",
    "idempotency_key": null
  },
  "type": "payment_intent.succeeded"
}