You can configure your Stripe Payment Gateway from the system settings:

•  Activate or deactivate Stripe functionality.
•   Choose between live or test modes for Stripe.
•   Add your Stripe secret key and publishable key.

For email marketing, you can integrate your SendGrid account:

•   Use this module to send leads via email.
•   Configure your SendGrid API key, name, and email for verification.
•   If you prefer not to use SendGrid, you can leave the settings unchanged.