--- title: "Billit API: connect it to your AI chat ยท Hypamoon" description: "The Billit 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/billit --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Billit Payments and billing # Connect Billit to Hypamoon Yes. Billit 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 Billit, answered from its own docs. **Public API docs**\ **Yes.** Public developer docs with guides for invoices, Peppol e-invoicing and webhooks. [Read the docs](https://docs.billit.be/) **A key you create yourself**\ **Yes.** For your own, non-commercial integration you use the API key and PartyID from your Billit profile; OAuth credentials for apps you sell come from Billit support. [docs.billit.be](https://docs.billit.be/docs/partyid-and-key) **Versions or a changelog**\ **Yes.** A dated API change log, and a versioning page that promises backwards compatibility. [docs.billit.be](https://docs.billit.be/docs/api-change-log) **How it signs in**\ The API key from your Billit profile plus your PartyID in the request headers; OAuth 2.0 for integrations offered to other companies. **Webhooks**\ **Yes.** It can tell your app when something changes. [docs.billit.be](https://docs.billit.be/docs/webhooks) **Hosting**\ Cloud **Condition**\ The API key is only allowed for integrations you use for your own administration; a commercial integration needs OAuth credentials from Billit. ## Your own invoice overview on Billit, built around the questions your team asks. - Sales and purchase invoices, customers and e-invoice statuses, straight from Billit. - AI that flags invoices that bounce or stay unpaid and tells the right person. - A screen for your team and a short weekly email for you. ### Ask your chat Answers straight from your Billit data, in Claude or another chat with the full Hypamoon connection. - Which sales invoices from last month are still unpaid? - Which e-invoices were not delivered over Peppol? ### When something happens Billit sends a webhook to your app, and the app asks AI what happens next. 1. When Billit reports a new status for an e-invoice, for example delivered or refused. AI decides AI reads the status and decides whether someone needs to act. Then The person who sent the invoice gets an email with what happened and what to do next. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Billit data. - For your team A screen with open invoices per customer and their delivery status, straight from Billit. ### Add Hypamoon Text messages, email, phone, payments and agents run in the same project as the adapter. - Agent on a schedule Once a week, an agent emails you the customers with the most overdue invoices. Billit 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 Billit 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. - Sandbox and production use separate keys and hosts (api.sandbox.billit.be and api.billit.be). ## 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 Billit. API docs: https://docs.billit.be/. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Billit.%20API%20docs%3A%20https%3A%2F%2Fdocs.billit.be%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. - [docs.billit.be/](https://docs.billit.be/) - [docs.billit.be/docs/partyid-and-key](https://docs.billit.be/docs/partyid-and-key) - [docs.billit.be/docs/api-change-log](https://docs.billit.be/docs/api-change-log) - [docs.billit.be/docs/webhooks](https://docs.billit.be/docs/webhooks) Billit 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 Billit. Found something that changed? Tell us at [support](https://hypamoon.com/support#contact). ## More in payments and billing - [**Adyen** Open](https://hypamoon.com/connect-to/adyen) - [**Authorize.net** Open](https://hypamoon.com/connect-to/authorize-net) - [**Buckaroo** Unknown](https://hypamoon.com/connect-to/buckaroo) - [**Chargebee** Open](https://hypamoon.com/connect-to/chargebee) - [**Klarna** Open](https://hypamoon.com/connect-to/klarna) - [**Mollie** Open](https://hypamoon.com/connect-to/mollie) - [**MultiSafepay** Open](https://hypamoon.com/connect-to/multisafepay) - [**PayPal** Open](https://hypamoon.com/connect-to/paypal) - [**Recurly** Open](https://hypamoon.com/connect-to/recurly) - [**Stripe** Open](https://hypamoon.com/connect-to/stripe) - [**WeFact** Open](https://hypamoon.com/connect-to/wefact) - [**Pay.** Open](https://hypamoon.com/connect-to/pay-nl) - [**easybill** Open](https://hypamoon.com/connect-to/easybill) - [**GoCardless** Open](https://hypamoon.com/connect-to/gocardless) - [**Paddle** Open](https://hypamoon.com/connect-to/paddle) - 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[**Avalara E-Invoicing** Possible](https://hypamoon.com/connect-to/avalara-e-invoicing) - [**Scrada** Possible](https://hypamoon.com/connect-to/scrada) - [**Digipoort** Possible](https://hypamoon.com/connect-to/digipoort) - [**Storecove** Unknown](https://hypamoon.com/connect-to/storecove) - [**Chorus Pro** Unknown](https://hypamoon.com/connect-to/chorus-pro) - [**Sovos** Possible](https://hypamoon.com/connect-to/sovos) - [**EDICOM** Unknown](https://hypamoon.com/connect-to/edicom) - [**ecosio** Possible](https://hypamoon.com/connect-to/ecosio) - [**Banqup** Open](https://hypamoon.com/connect-to/banqup) - [**Tradeshift** Open](https://hypamoon.com/connect-to/tradeshift) [All 1094 tools](https://hypamoon.com/connect-to) ## Tool not listed? 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 Billit? 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=billit) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~billit#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~billit#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)