If you are lucky enough to have a Poodll coupon code, you can use that on the Poodll payment page. Applying it will give you a full or partial discount on the package/plugin price. 

To begin, visit the checkout page for the product you are interested in. There are several ways to get there. One way is to visit the Poodll pricing page at: https://poodll.com/poodll-pricing and tap the "Go" button.

That will take you to the checkout page for the package/plugin. Choose the correct package for your organization type and press "Go."

If you are not logged in, you will be asked for information such as your name and email address. If you already have an account you should login first and return to the checkout page. On the payment page you can choose from "Invoice(offline)" or credit card as payment options. On this page  look for the "Have a coupon?" link. Tap that and enter your coupon code.

After purchasing your Poodll product be sure to:
  •  register your site URL (beginning with https:// ) on your member's page, https://poodll.com/member 
  • pick up your API user and API secret also from the member's page. You will need to enter those in your plugin's settings page on Moodle.

Good luck