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+<#
+.SYNOPSIS
+    Installs/configures the Datto RMM agent, fetches site lists, and optionally saves the site list to disk.
+
+.DESCRIPTION
+    Centralizes Datto RMM operations in one function:
+      - Fetch API credentials from a webhook (-UseWebhook)
+      - Acquire OAuth token
+      - Fetch site list (-FetchSites)
+      - Save site list to Desktop as JSON or CSV (-FetchSites + -SaveSitesList)
+      - Write site variables to registry (-PushSiteVars)
+      - Download & launch the RMM agent installer (-InstallRMM)
+      - Save a copy of the installer (-SaveCopy)
+
+.PARAMETER UseWebhook
+    Fetches ApiUrl, ApiKey, and ApiSecretKey from the webhook when used with WebhookPassword.
+
+.PARAMETER WebhookPassword
+    Password for authenticating to the credentials webhook.
+
+.PARAMETER WebhookUrl
+    URL of the credentials webhook. Defaults to $Global:DattoWebhookUrl.
+
+.PARAMETER ApiUrl
+    Direct Datto API endpoint URL (if not using webhook).
+
+.PARAMETER ApiKey
+    Direct Datto API key (if not using webhook).
+
+.PARAMETER ApiSecretKey
+    Direct Datto API secret (if not using webhook).
+
+.PARAMETER FetchSites
+    Fetches the list of sites and skips all install steps.
+
+.PARAMETER SaveSitesList
+    Saves the fetched site list to Desktop using OutputFile. Must be used with -FetchSites.
+
+.PARAMETER OutputFile
+    Filename for saving the site list (.json or .csv). Defaults to 'datto_sites.csv'.
+
+.PARAMETER PushSiteVars
+    Writes fetched site variables into HKLM:\Software\SVS\Deployment.
+
+.PARAMETER InstallRMM
+    Downloads and runs the Datto RMM agent installer.
+
+.PARAMETER SaveCopy
+    Saves a copy of the downloaded agent installer to C:\Temp.
+
+.PARAMETER SiteUID
+    Unique identifier of the Datto site (required for install and registry push).
+
+.PARAMETER SiteName
+    Friendly name of the Datto site (used for logging).
+
+.EXAMPLE
+    # Fetch and save site list via webhook
+    Install-DattoRMM -UseWebhook -WebhookPassword 'Tndmeeisdwge!' -FetchSites -SaveSitesList -OutputFile 'sites.csv'
+
+.EXAMPLE
+    # Headless install with site variables
+    Install-DattoRMM -ApiUrl 'https://api.example.com' -ApiKey 'KeyHere' -ApiSecretKey 'SecretHere' \
+      -SiteUID 'site-123' -SiteName 'Acme Corp' -PushSiteVars -InstallRMM
+
+.EXAMPLE
+    # Download and save installer to C:\Temp without installing
+    Install-DattoRMM -ApiUrl 'https://api.example.com' -ApiKey 'KeyHere' -ApiSecretKey 'SecretHere' \
+      -SiteUID 'site-123' -SiteName 'Acme Corp' -SaveCopy
+#>
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