Magento 2: Go live with Mollie

You can only accept actual payments after Mollie has approved your website profile.

What you need to do in advance

Ensure that you've completed the Mollie signup process.
Set up the module according to your preferences.
Test your payment methods to ensure that they work properly.
Get your live API key from your Mollie Dashboard under Developers > API keys.
If you have a multiple websites or stores, keep in mind that configuration settings apply to all levels of the hierarchy by default. Ensure that you understand how sites, stores, and view scopes work↗, and change the scope↗ if needed.

Log in to your Mollie Dashboard.
Go to Developers > API keys.
Copy the live API key.
Log in to Magento 2.
Go to Stores > Configuration.
On the Configuration page, scroll to Mollie, select the arrow, and then General.
Select Live from the Modus drop-down menu under API details.
Paste your live API key in the Live API key field.
Click Test API key to ensure your API key is correct.
Save the changes.