条纹："It's often a good idea to store an email address in metadata for tracking later"
Stripe: "It's often a good idea to store an email address in metadata for tracking later"
在 Stripe 的 Charge documentation 中，对于字段 metadata，有这样的建议：
It's often a good idea to store an email address in metadata for tracking later
为什么？电子邮件已经在 receipt_email 字段中设置，不是吗？
为什么 Stripe 建议也将电子邮件存储在元数据中？
如果您使用 receipt_email parameter, then Stripe will send an email receipt to that address. You might want to create charges without sending a receipt however, so in that case it would make sense to keep the email address as a metadata 字段。
在 Stripe 的 Charge documentation 中，对于字段 metadata，有这样的建议：
It's often a good idea to store an email address in metadata for tracking later
为什么？电子邮件已经在 receipt_email 字段中设置，不是吗？
为什么 Stripe 建议也将电子邮件存储在元数据中？
如果您使用 receipt_email parameter, then Stripe will send an email receipt to that address. You might want to create charges without sending a receipt however, so in that case it would make sense to keep the email address as a metadata 字段。