In your eSputnik account, please select Settings -> API, and click 'New key' button to create new API key
Add some basic description to your API Key, like 'ngrow', and make sure 'Full access to API' is selected
Go to Data export page, and add a webhook, provided to you during nGrow app onboarding on 'Select Email Service Provider' page (that looks like https://email-webhooks.ngrow.ai/api/v1/web2wave-webhook/<ngrow_app_id>). Make sure Real-time update is selected for the new webhook