In your Workato account, click on the "Subscribe" button on the upper right of the page as seen in the following screenshot:
This will redirect you to a page with our pricing plans. Select your desired plan:
You will be prompted to enter your credit card details to complete payment. If you would like to instead pay via invoice, please open a ticket here.
Do note that the pricing options in the screenshot may not be up to date. Do refer to our pricing page for updated pricing plans.