How to export the the powershell result to one txt file

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PowerShell

Windows instance run the following PowerShell command：

Invoke-RestMethod http://100.100.100.200/latest/meta-data/ram/security-credentials/EcsRamRoleDocumentTesting

then it will Obtain a temporary authorization Token result：

{
"AccessKeyId" : "<youraccesskeyid>",
"AccessKeySecret" : "<youraccesskeysecret>",
"Expiration" : "2017-11-01T05:20:01Z",
"SecurityToken" : "<yoursecuritytoken>",
"LastUpdated" : "2017-10-31T23:20:01Z",
"Code" : "Success"
}


I would like to know How to export the the result to one txt file with below format:

[Credentials]
language=EN
endpoint=ABCD
accessKeyID=<youraccesskeyid>
accessKeySecret=<youraccesskeysecret>
stsToken=<yoursecuritytoken>

and this powershell will run every hours and every time need to overwite the result in txt file.

What I have tried:

run the powershell is no problem, need to export the result.