Payments Overview

Atrium integrates with Stripe to let clients pay invoices directly from the portal. You choose one of two modes depending on how you’re set up.

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Modes at a glance

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Payment flow

Once payments are configured, the flow works like this:

1. You send an invoice to a client — it appears in the portal under their project.
2. The client clicks Pay Invoice in the portal.
3. Atrium opens a Stripe Checkout session in a new tab.
4. The client completes payment on Stripe’s hosted checkout page.
5. Stripe sends a checkout.session.completed webhook to Atrium.
6. Atrium marks the invoice as paid automatically.

No manual reconciliation required.

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Accepted payment methods

After connecting Stripe, you can choose which payment methods to offer clients from Settings → System → Client Payments → Accepted payment methods. Available methods depend on your Stripe account’s capabilities. Supported methods include: Card, ACH bank transfer, Link, SEPA Direct Debit, iDEAL, Bacs Direct Debit, Klarna, Afterpay/Clearpay, Affirm, and Cash App Pay.

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Choosing a mode

Use Direct Keys if:

• You’re a single agency or freelancer
• You want the simplest possible setup
• You’d rather not configure environment variables beyond API_URL

Use Stripe Connect if:

• You’re building a platform where multiple organizations connect their own Stripe accounts
• You prefer OAuth over storing a raw secret key
• You need to listen to events across connected accounts

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Next steps