--- title: "Billomat API: connect it to your AI chat ยท Hypamoon" description: "The Billomat API is open, signs in with an API key and sends webhooks. What your AI chat can build with it on Hypamoon, with sources." url: https://hypamoon.com/connect-to/billomat --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Billomat Payments and billing # Connect Billomat to Hypamoon Yes. Billomat has a public, versioned API and you create the key yourself, so your chat can write the adapter. Open ## The check Three questions about the API of Billomat, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://www.billomat.com/api/) **A key you create yourself**\ **Yes.** A user enables API access under Settings, Employees and generates a personal API key. [billomat.com](https://www.billomat.com/api/grundlagen/authentifizierung/) **Versions or a changelog**\ **Yes.** Changes to the API are announced in Billomat's release notes. [billomat.com](https://www.billomat.com/api/) **How it signs in**\ A personal API key per user, sent in the X-BillomatApiKey header; a registered app adds X-AppId and X-AppSecret for a higher call quota. **Webhooks**\ **Yes.** It can tell your app when something changes. [billomat.com](https://www.billomat.com/api/webhooks/) **Hosting**\ Cloud ## Your own invoice overview on Billomat, built around how your customers pay. - Clients, quotes, invoices, reminders, credit notes and incoming invoices, straight from Billomat. - AI that spots customers who start paying late and drafts a friendly reminder, with you approving every send. - A portal for your customers and an email to your team when something changes. ### Ask your chat Answers straight from your Billomat data, in Claude or another chat with the full Hypamoon connection. - Which invoices are overdue and have had no reminder yet? - Which quotes were sent more than two weeks ago without an answer? ### When something happens Billomat sends a webhook to your app, and the app asks AI what happens next. 1. When A payment is added to an invoice. AI decides AI checks whether the invoice is now fully paid and whether the customer was late before. Then The account manager gets a short email. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Billomat data. - For your customers Customers sign in and see their quotes and open invoices from Billomat. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Email A reminder draft for overdue invoices, created in Billomat after you approve. AI proposes, you approve Billomat stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Billomat waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow. - Calls are counted in 15 minute windows; without a registered app, all unregistered services on an account share one pool. Webhooks do not count toward the quota. ## Try it in your chat Fill in what to read and write, and send it. Say this in your chat > Build the Hypamoon recipe build-an-adapter for Billomat. API docs: https://www.billomat.com/api/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Billomat.%20API%20docs%3A%20https%3A%2F%2Fwww.billomat.com%2Fapi%2F.%20Read%3A%20%5Bwhat%5D.%20Write%3A%20%5Bwhat%2C%20or%20nothing%5D.) In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. [The full recipe](https://hypamoon.com/r/build-an-adapter) ## Sources Checked on 7 November 2026. - [www.billomat.com/api/](https://www.billomat.com/api/) - [www.billomat.com/api/grundlagen/authentifizierung/](https://www.billomat.com/api/grundlagen/authentifizierung/) - [www.billomat.com/api/webhooks/](https://www.billomat.com/api/webhooks/) Billomat is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Billomat. Found something that changed? 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Ask the chat to check its API. The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found. Say this in your chat > Check if \[software\] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used. [Open in Claude](https://claude.ai/new?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) [Open in ChatGPT](https://chatgpt.com/?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) Fill in the name of your software. Checking needs no connection to Hypamoon. ## Ready to connect Billomat? Connect your chat once, then ask it to build the adapter. [Start free](https://app.hypamoon.com/?mode=signup&utm_source=connect-to&utm_campaign=billomat) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~billomat#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~billomat#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)