Config-ApiKeys.ps1

# Script variables.
$functionAppId = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{functionAppName}';
$functionAppKey = @{
    Name = 'ApiKey'
    Value = '<my-secret-api-key>'
};

$headers = @{Authorization = ("Bearer {0}" -f $(GetToken))};
$body = @{Properties = $functionAppKey} | ConvertTo-Json;

## List api keys
Invoke-WebRequest `
    -Method POST `
    -Headers $headers `
    -Uri $("https://management.azure.com/{0}/host/default/listkeys?api-version=2019-08-01" -f $functionAppId);

## Create/Update api keys
Invoke-WebRequest `
    -Method PUT `
    -Headers $headers `
    -Body $body `
    -ContentType "application/json" `
    -Uri $("https://management.azure.com/{0}/host/default/functionKeys/{1}?api-version=2019-08-01" -f $functionAppId,$functionAppKey.name);

## Delete api key
Invoke-WebRequest `
    -Method DELETE `
    -Headers $headers `
    -Uri $("https://management.azure.com/{0}/host/default/functionKeys/{1}?api-version=2019-08-01" -f $functionAppId,$functionAppKey.Name);