我正在调用 API 以在 RingCentral 上刷新我的访问令牌,但它会引发以下错误
{
"error":"invalid_request",
"error_description":"Unsupported grant type",
"errors":[
{
"errorCode":"OAU-250",
"message":"Unsupported grant type"
}
]
}
谁能帮我吗?