For Self-Hosted n8n (License Key Activation)
If you are hosting n8n on your own infrastructure and have purchased a license (for example, Pro or Enterprise features), you can activate it either through the UI or by using environment variables.
Log in to your self-hosted n8n instance as an Admin or Owner.
Navigate to Settings > Usage and Plan.
Click Enter activation key.
Paste your license key and click Activate.
For n8n Cloud (Paid / Pro Plan)
To upgrade from a free trial or free account to a paid n8n Cloud plan:
Log in to your n8n Cloud instance.
Click the Upgrade button in the upper-right corner.
Select your preferred plan (for example, Pro) and billing cycle (monthly or annually).
Enter your payment details to complete the upgrade and activate the plan.