我正在开发一个逻辑应用程序，它应该在一天内调用一个特定的API来检索响应（令牌），在接下来的步骤（尚未编写）中，它将联系另一个API，最后将结果存储在Google电子表格上。问题是在第一次调用时，阅读MailUp的文档，我必须发送一个URL调用，以使用用户名和密码身份验证（https://help.mailup.com/display/mailupapi/Authenticating+with+OAuth+v2）检索令牌，但它不起作用！有人能帮帮我吗？

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "HTTP": {
                "inputs": {
                    "headers": {
                        "Authorization": "BASE64_ENCODED_CLIENTCREDENTIALS",
                        "Content-Type": "application/x-www-form-urlencoded"
                    },
                    "method": "POST",
                    "queries": {
                        "grant_type": "password",
                        "password": "password",
                        "username": "username"
                    },
                    "uri": "https://services.mailup.com/Authorization/OAuth/Token"
                },
                "runAfter": {
                    "Initialize_variable": [
                        "Succeeded"
                    ]
                },
                "type": "Http"
            },
            "Initialize_variable": {
                "inputs": {
                    "variables": [
                        {
                            "name": "responseBody",
                            "type": "String",
                            "value": ""
                        }
                    ]
                },
                "runAfter": {},
                "type": "InitializeVariable"
            },
                "type": "ApiConnection"
            },
            "Set_variable": {
                "inputs": {
                    "name": "responseBody",
                    "value": "@{body('HTTP')}"
                },
                "runAfter": {
                    "HTTP": [
                        "Succeeded"
                    ]
                },
                "type": "SetVariable"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {
            "$connections": {
                "defaultValue": {},
                "type": "Object"
            }
        },
        "triggers": {
            "Recurrence": {
                "evaluatedRecurrence": {
                    "frequency": "Day",
                    "interval": 1
                },
                "recurrence": {
                    "frequency": "Day",
                    "interval": 1
                },
                "type": "Recurrence"
            }
        }
    },
    "parameters": {
        "$connections": {
            "value": {
            }
        }
    }
}

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