Privy is a 3rd party app which provides various signup forms and popups to collect new email subscribers. Link Privy with Soundest and your new subscribers will conveniently appear in Soundest lists. Here is how to do that:
Go to the Privy Linked accounts page and click “Soundest” under available integrations.
In the dialog that follows, enter your Soundest Email, and a Soundest API Key for this integration. Make sure this key allows adding contacts. You can manage your Soundest API Keys here. If you do not have an API Key, follow this tutorial to create one. Choose the default permission setting when creating a new key.
Click “Link Account.”
Under each Privy campaign’s settings, configure “Email Sync” to send contacts to a specified Soundest list.
If you face any issues, you can check out the Privy's troubleshooting tips.