Step 1: Head over to the Vajro + Blynk tab in the Billing section
As you already know, Blynk is available only for Growth and Power Premium plan users.
Step 2: Once you pick your plan. click on Activate Vajro + Blynk
You'll be redirected to a Shopify page where you'll be asked to approve subscription
You'll see a section that has an overview of your subscription plan that mentions the maximum amount that you will be charged each month.
Step 3: Once you've taken a look at it, click on Approve Subscription
And done! Blynk will now be activated for your store.
P.S. Charges for Blynk is mentioned in the billing page. And yes, your first $25,000 is on us!