有人使用Sendgrid的v3/marketing/singlessends端点吗？此请求不适用于POST或PUT。这个错误就像服务器错误有什么想法吗？
Client error: `POST https://api.sendgrid.com/v3/marketing/singlesends` resulted in a `400 BAD REQUEST` response:
{"errors":[{"field":"","message":"json could not be unmarshalled"}]}
当您提供错误的输入时会发生此错误。此外，5月6日更改了api
https://sendgrid.com/docs/for-developers/sending-email/single-sends-2020-update/