Paste the key and token into the matching Live or Sandbox fields.
- Go to WooCommerce → Settings → Payments → Paddle.
- Set Paddle account type to Paddle Billing.
- Paste the key into Sandbox API key (or Live API key).
- Paste the token into Sandbox client-side token (or Live client-side token).
- Click Save changes.
Check the token prefix
A sandbox token must start with test_ and a live one with live_. With the wrong prefix, Paddle stays hidden at checkout.
Next: Set up the webhook.