AzureFunctionRequestCard.ps1

using namespace System.Net

# Input bindings are passed in via param block.
param($Request, $TriggerMetadata)

$uri = ""
$refreshUri = ""

$actionCardAa = @'
{
    "@type": "MessageCard",
    "@context": "https://schema.org/extensions",
    "summary": "Card \"Test card\"",
    "themeColor": "00A4EF",
    "title": "Manually Open or Close Auto Attendant",
    "text": "Click 'Open' or 'Close' to manually override your scheduled office hours.",
    "potentialAction": [
        {
            "@type": "ActionCard",
            "name": "Add a comment",
            "inputs": [
                {
                    "@type": "MultichoiceInput",
                    "id": "list",
                    "isMultiSelect": "false",
                    "choices": [
                      { "display": "Open", "value": "open" },
                      { "display": "Close", "value": "close" }                    
                      ]
                }
            ],
            "actions": [
                {
                    "@type": "HttpPOST",
                    "name": "Submit Config",
                    "target": "refreshUriPlaceholder",
                    "body": "{\r\n \"action\": \"{{list.value}}\", \"changeType\": \"autoAttendant\"\r\n}",
                    "headers": [
                        {
                            "Content-Type": "application/json"
                        }
                    ]
                }
            ]
        }
    ]
}
'@

$actionCardAa = $actionCardAa.Replace("refreshUriPlaceholder",$refreshUri)

Invoke-RestMethod -uri $uri -Method Post -body $actionCardAa -ContentType 'application/json; charset=UTF-8'

    $body = @'
{
    "@context": "https://schema.org/extensions",
    "@type": "MessageCard",
    "themeColor": "00A4EF",
    "title": "Config Change Request received",
    "text": "Your config change request has been received."
}
'@



# Associate values to output bindings by calling 'Push-OutputBinding'.
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    headers = @{'content-type'='application/json'; 'charset'='utf8'; 'CARD-UPDATE-IN-BODY'='true'}
    StatusCode = [HttpStatusCode]::OK
    Body = $body
})