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These methods route your SellAuth checkout through a merchant account on another commerce platform. They are useful when that platform has already approved you, when it handles your tax, or when you prefer its payout terms. Shopify and Dodo Payments work the same way and have their own pages.
Webhook URLs look like https://webhooks.sellauth.com/v1/PROVIDER/YOUR_SHOP_ID. The exact URL with your shop ID is shown in the setup instructions on the payment method page in the dashboard.

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Lemon Squeezy

Cards, Apple Pay, Google Pay, PayPal and Cash App. Lemon Squeezy acts as merchant of record, so it handles sales tax and VAT for you. The setup is unusual in one respect. You create a placeholder product in Lemon Squeezy, and SellAuth charges against its variant.
1

Create an API key

On the API settings page, click the + icon, name it SellAuth, and set the expiry as far out as it allows. Copy the key into API Key.
2

Copy your store ID

On the Stores page, it appears as #XXXXXX next to your store link. Copy the number into Store ID.
3

Create the placeholder product

On the Products page, create a product named SellAuth Product priced at $1, leaving everything else at its default. Publish it.
4

Copy the variant ID

Click the three dots next to the product’s Share button, choose Copy variant ID, and paste it into Variant ID. Save.
Do not delete or unpublish the placeholder product. Every SellAuth payment charges against its variant, so removing it breaks the method.

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Pandabase

Cards, Apple Pay, Google Pay and Cash App.
1

Copy your store ID

Open the Pandabase merchant dashboard and look at the URL: .../dash/stores/shp_xxxxxxxxxxxxxxxx. The shp_... part is your store ID.
2

Create an API key

In the sidebar go to Developers > API Keys and click Create API Key. Name it SellAuth, leave the note empty, set Auth Mode to Bearer, and grant all permissions, or at minimum read and write on Payments and Webhooks.
3

Paste and save

Copy the generated key into API Key alongside the store ID.

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Whop

Cards, Apple Pay, Google Pay and PayPal.
1

Copy your company ID

In the Whop dashboard, select your business and read the URL: https://whop.com/dashboard/biz_XXXXXXXXXXXX. The biz_... part is your company ID.
2

Create an API key

Click Developer at the bottom of the sidebar, then Create next to Company API keys. Name it SellAuth and grant these permissions:
Copy the key into API Key.
3

Create the webhook

On the same page click Create Webhook and enter your SellAuth webhook URL. Select only these events, and nothing else:
4

Copy the webhook secret

Once created, click the blue secret (it looks like ws_xxxxx) to copy it, and paste it into Webhook Secret. Save.

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Troubleshooting

Buyers pay but orders never deliver. Check the webhook first for a wrong URL, missing events, or a secret that does not match what you pasted. Lemon Squeezy payments fail. The placeholder product was deleted, unpublished, or its variant ID changed. Permission errors. The API key is missing a scope. Create a new key with the permissions listed above rather than editing the old one.

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Next steps

Shopify

The same approach, through your Shopify store.

Supported payment methods

Everything else you can connect.