# Approve and log rack power overage charges with Google Sheets: n8n workflow > Started by another system calling it, and works across Gmail, Google Sheets, Telegram and n8n data table. It hands the judgement calls to OpenAI. Source: https://millionrounds.com/workflow/approve-and-log-rack-power-overage-charges-with-google-sheet (Millionrounds; every figure on the page links to its filing or article) [Automation library](https://millionrounds.com/workflows) · [Chat assistants](https://millionrounds.com/workflows?category=Chat+assistants#library) # Approve and log rack power overage charges with Google Sheets Started by another system calling it, and works across Gmail, Google Sheets, Telegram and n8n data table. It hands the judgement calls to OpenAI. 19 steps, 2 branches: a working afternoon to understand properly. Medium Calls a model: OpenAI [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fapprove-and-log-rack-power-overage-charges-with-google-sheet) **19 steps** Medium: a working afternoon **2** Branches: places the flow splits **0** Loops or waits **4** Services it connects to ## The flow Starts it 1 Model 2 Logic 8 Service 8 The steps in the order they run, from what starts it. - 1 **Rack Power Threshold Alert** Webhook *Starts it* - 2 **Overage Drafting Model** Lm Chat Open Ai *Model* - 3 **Normalize Alert Payload** Set *Logic* - 4 **Draft Overage Invoice Adjustment** Agent *Model* - 5 **Fetch Customer Contract Power Allocation** Google Sheets *Service* - 6 **Request Ops Manager Approval** Gmail *Service* - 7 **Compute Overage Amount & Billing Tier** Code *Logic* - 8 **Branch on Approval** Switch *Logic* - 9 **Check Overage Threshold** If *Logic* - 10 **Commit Overage Charge** Http Request *Service* - 11 **Apply Manager Override Amount** Code *Logic* - 12 **Log Waiver Granted** Data Table *Service* - 13 **Log Grace Period Pass** Set *Logic* - 14 **Merge Billing Outcomes** Merge *Logic* - 15 **Notify Customer No Charge** Gmail *Service* - 16 **Shape Billing Record** Set *Logic* - 17 **Log Billing Decision** Data Table *Service* - 18 **Update Sheets Billing Ledger** Google Sheets *Service* - 19 **Notify Finance** Telegram *Service* ## How it's built - **Starts on:** Another system calling it - **Steps:** 19, with 2 branches - **Size:** Medium: a working afternoon - **Connects to:** Gmail, Google Sheets, Telegram, n8n data table - **Model:** OpenAI ## Questions What does it need to run? An n8n account, plus your own Gmail, Google Sheets and Telegram accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included. What starts it? It starts on another system calling it. Does it use AI? Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n. How long does it take to set up? Plan an afternoon. 19 steps is enough that you should read each one before running it. How do I import it? Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts. **Before you run it** Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 19 steps before you point it at anything that matters. ## Run it in n8n - **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n) - **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fapprove-and-log-rack-power-overage-charges-with-google-sheet) - **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts. Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind. ## Connects to Each opens the other workflows that use it. [Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Telegram](https://millionrounds.com/workflows?service=Telegram#library)[n8n data table](https://millionrounds.com/workflows?service=n8n+data+table#library) ## Workflows like it Also chat assistants, with the same services where possible, closest in size first. - [**Classify and reply to Gmail messages with OpenAI and Airtable** 19 steps · calls a model · Airtable, Gmail](https://millionrounds.com/workflow/classify-and-reply-to-gmail-messages-with-openai-and-airtabl) - [**Create a context-aware Slack assistant with Google Sheets** 19 steps · calls a model · Google Sheets, Pinecone](https://millionrounds.com/workflow/create-a-context-aware-slack-assistant-with-google-sheets) - [**Create realistic exam study plans with Telegram and Gemini** 19 steps · calls a model · Google Sheets, Telegram](https://millionrounds.com/workflow/create-realistic-exam-study-plans-with-telegram-and-gemini) - [**Daily news digest from RSS and YouTube with Gemini** 19 steps · calls a model · RSS, Telegram](https://millionrounds.com/workflow/daily-news-digest-from-rss-and-youtube-with-gemini) - [**Digital Product Shop Telegram Chatbot with Auto Sent Download** 19 steps · calls a model · Email, Google Sheets](https://millionrounds.com/workflow/digital-product-shop-telegram-chatbot-with-auto-sent-downloa) - [**Dispatch field service jobs with OpenAI and Google Sheets** 19 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/dispatch-field-service-jobs-with-openai-and-google-sheets)