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You control which channels are active. Airdun sequences messages across whichever channels you enable, and adjusts automatically if you add or remove one later. There is no minimum or maximum.
1

Open the Channels page

In your Airdun dashboard, navigate to Channels from the left sidebar. You’ll see a card for each available channel with its current activation status.
2

Enable Email

Toggle Email on. Recovery emails are sent from a sender persona tied to your own domain.
Email requires at least one configured sender persona with a verified sending domain before it can go live. See the Sender Personas guide to set that up first.
3

Enable SMS

Toggle SMS on. Airdun provisions a phone number on your behalf — there is nothing to configure on your end. Messages are sent from a local number where available.
4

Enable WhatsApp

Toggle WhatsApp on. Airdun manages the WhatsApp Business API setup, so you do not need a Meta Business account or additional credentials.
5

Enable the In-App Wall

Toggle In-app wall on. This channel requires the Airdun snippet to be installed in your application.
Installation instructions are in the In-App Wall guide. Once the snippet is in place, wall behavior is controlled entirely from the dashboard.
After enabling, choose your wall mode under In-App Wall Settings:

Soft Block

Displays a banner prompting the user to update their payment method. The user can still access your product.

Hard Block

Restricts access to your product until the user resolves their payment.
Wall copy adapts automatically to the failure reason and account type; you do not write separate copy per scenario.

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Smart Retries

Below the channel toggles is the Smart Retries setting. When enabled, Airdun schedules retry attempts based on three inputs rather than a fixed interval:

Payday-Aware

Retries are timed around typical payday cycles in the customer’s region.

Country-Aware

Retry cadence accounts for local banking norms and public holidays.

Failure-Aware

The retry strategy adapts to the specific failure code.
Toggling Smart Retries on activates all three behaviors. Disabling it reverts to Stripe’s default retry schedule. See Smart Retries for the detail on each input.