Paddle Classic needs three values: your Vendor ID, an API Auth Code and your public key.
- In the Paddle dashboard, open Developer Tools → Authentication and copy your Vendor ID and an API Auth Code.
- Open Developer Tools → Public Key and copy the whole key, including the
-----BEGIN PUBLIC KEY-----and-----END PUBLIC KEY-----lines. - In WordPress go to WooCommerce → Settings → Payments → Paddle, set Paddle account type to Paddle Classic (legacy) and paste the values into the Sandbox (or Live) fields: Vendor ID, API Auth Code and Public Key. Save.
- Click Test connection.
Paste the complete public key
Payments are only marked paid when Paddle’s signature verifies against this key. Always include the BEGIN and END lines.
Next: Webhook alerts.