To connect your personal account or organisation account to external systems you can use Apps. Press the Settings gear icon in the top menu bar and then press Apps in the left navigation menu.

Each App will guide you through connecting to an external service and will store the credentials required to use the service within Clause so that your contracts can automate the use of the service. 

For example, the App for Stripe triggers a secure authorisation flow that provides Clause with a token that it can use to collect credit card payments on your behalf, sending the payments to your Stripe account. In this scenario Clause never sees any credit card numbers and you retain control of your Stripe account and can revoke Clause's access to your Stripe account at any time via the Stripe dashboard.