> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dodopayments.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Resend

> 通过 Resend 发送基于 Dodo Payments 事件的事务性电子邮件，确保高送达率。

## 介绍

在支付事件发生时自动发送专业的事务性电子邮件。通过 Resend 可靠的电子邮件基础设施和优秀的送达率，发送支付确认、订阅更新和重要通知。

<Info>
  此集成需要您的 Resend API 密钥进行身份验证。
</Info>

## 开始使用

<Steps>
  <Step title="Open the Webhook Section">
    在您的 Dodo Payments 仪表板中，导航到 <b>Webhooks → + 添加端点</b> 并展开集成下拉菜单。

    <Frame>
      <img src="https://mintcdn.com/dodopayments/slbAEdrLLwKHfaRf/images/integrations/resend.png?fit=max&auto=format&n=slbAEdrLLwKHfaRf&q=85&s=80191f648ad4a4f4b5e8186668da0791" alt="Add Endpoint and integrations dropdown" style={{ maxHeight: '500px', width: 'auto' }} width="1668" height="946" data-path="images/integrations/resend.png" />
    </Frame>
  </Step>

  <Step title="Select Resend">
    选择 <b>Resend</b> 集成卡片。
  </Step>

  <Step title="Enter API Key">
    在配置中提供您的 Resend API 密钥。
  </Step>

  <Step title="Configure Transformation">
    编辑转换代码以将电子邮件格式化为 Resend 的 API 所需格式。
  </Step>

  <Step title="Test & Create">
    使用示例有效负载进行测试，然后单击 <b>Create</b> 以激活电子邮件发送。
  </Step>

  <Step title="Done!">
    🎉 付款事件现在将通过 Resend 自动触发事务性电子邮件。
  </Step>
</Steps>

## 转换代码示例

### 支付确认电子邮件

```javascript payment_confirmation.js icon="js" expandable theme={null}
function handler(webhook) {
  if (webhook.eventType === "payment.succeeded") {
    const p = webhook.payload.data;
    webhook.url = "https://api.resend.com/emails";
    webhook.payload = {
      from: "payments@yourdomain.com",
      to: [p.customer.email],
      subject: "Payment Confirmation - $" + (p.total_amount / 100).toFixed(2),
      html: `
        <h2>Payment Successful!</h2>
        <p>Hi ${p.customer.name},</p>
        <p>Your payment of $${(p.total_amount / 100).toFixed(2)} has been processed successfully.</p>
        <ul>
          <li><strong>Payment ID:</strong> ${p.payment_id}</li>
          <li><strong>Amount:</strong> $${(p.total_amount / 100).toFixed(2)}</li>
          <li><strong>Date:</strong> ${new Date(webhook.payload.timestamp).toLocaleDateString()}</li>
          <li><strong>Method:</strong> ${p.payment_method || "Unknown"}</li>
        </ul>
        <p>Thank you for your business!</p>
      `,
      text: `Payment Successful! Your payment of $${(p.total_amount / 100).toFixed(2)} has been processed. Payment ID: ${p.payment_id}`
    };
  }
  return webhook;
}
```

### 订阅欢迎电子邮件

```javascript subscription_welcome.js icon="js" expandable theme={null}
function handler(webhook) {
  if (webhook.eventType === "subscription.active") {
    const s = webhook.payload.data;
    webhook.url = "https://api.resend.com/emails";
    webhook.payload = {
      from: "welcome@yourdomain.com",
      to: [s.customer.email],
      subject: "Welcome to Your Subscription!",
      html: `
        <h2>Welcome to Your Subscription!</h2>
        <p>Hi ${s.customer.name},</p>
        <p>Your subscription has been activated successfully.</p>
        <ul>
          <li><strong>Subscription ID:</strong> ${s.subscription_id}</li>
          <li><strong>Product:</strong> ${s.product_id}</li>
          <li><strong>Amount:</strong> $${(s.recurring_pre_tax_amount / 100).toFixed(2)}/${s.payment_frequency_interval}</li>
          <li><strong>Next Billing:</strong> ${new Date(s.next_billing_date).toLocaleDateString()}</li>
        </ul>
        <p>You can manage your subscription anytime from your account dashboard.</p>
      `,
      text: `Welcome! Your subscription is now active. Amount: $${(s.recurring_pre_tax_amount / 100).toFixed(2)}/${s.payment_frequency_interval}`
    };
  }
  return webhook;
}
```

### 支付失败通知

```javascript payment_failure.js icon="js" expandable theme={null}
function handler(webhook) {
  if (webhook.eventType === "payment.failed") {
    const p = webhook.payload.data;
    webhook.url = "https://api.resend.com/emails";
    webhook.payload = {
      from: "support@yourdomain.com",
      to: [p.customer.email],
      subject: "Payment Failed - Action Required",
      html: `
        <h2>Payment Failed</h2>
        <p>Hi ${p.customer.name},</p>
        <p>We were unable to process your payment of $${(p.total_amount / 100).toFixed(2)}.</p>
        <ul>
          <li><strong>Payment ID:</strong> ${p.payment_id}</li>
          <li><strong>Amount:</strong> $${(p.total_amount / 100).toFixed(2)}</li>
          <li><strong>Error:</strong> ${p.error_message || "Payment processing failed"}</li>
        </ul>
        <p>Please update your payment method or contact support for assistance.</p>
        <a href="https://yourdomain.com/update-payment">Update Payment Method</a>
      `,
      text: `Payment Failed: We couldn't process your $${(p.total_amount / 100).toFixed(2)} payment. Please update your payment method.`
    };
  }
  return webhook;
}
```

## 提示

* 使用经过验证的发件人域以提高送达率
* 包含电子邮件的 HTML 和文本版本
* 使用客户数据个性化内容
* 使用清晰、以行动为导向的主题行
* 包含退订链接以确保合规
* 在上线前测试电子邮件模板

## 故障排除

<AccordionGroup>
  <Accordion title="Emails not being sent">
    * 验证 API 密钥正确并处于激活状态
    * 确认发件人域名已在 Resend 中验证
    * 确保收件人电子邮件地址有效
    * 检查 Resend 的发送限制和配额
  </Accordion>

  <Accordion title="Transformation errors">
    * 验证 JSON 结构是否匹配 Resend API 格式
    * 检查是否包含所有必填字段
    * 确保 HTML 内容格式正确
    * 验证发件人电子邮件地址是否已验证
  </Accordion>
</AccordionGroup>