Go to tiendanube.com and click on Access my panel.
Log in with your store account on Tiendanube.
Once inside your store's panel, go to the left side menu and select Settings.
In the Payment methods section, scroll down until you find Ecart Pay.
Click on the Activate button.
Accept the terms to integrate Ecart Pay to Tiendanube by clicking on Accept and start using.
Click on Start setup.
Log in with your Ecart Pay account.
You will see your active session; make sure the email matches the one for your store on Tiendanube.
Click on Continue.
A notice will be displayed confirming that the integration was successfully configured.
Click on Go to Tiendanube to return to your store's panel.
In your Tiendanube panel, go to Settings > Payment methods again.
You will see that Ecart Pay is already installed and activated.