Google Play Renewal & Comic Connect add-on question

I purchased CLZ app through Google Play and my yearly renewal is coming up in October.
However, I want to renew & add on Comic Connect and the only way to do both with the discounted price is via the website.

Will my account/collection be affected if I renew a different way since last time?

Your account or collection will not be affected if you switch to a different payment method.
If you switch to paying through our CLZ Shop, do not forget to CANCEL your subscription in the Play Store, otherwise Google will charge you too.

That said, we actually prefer all subscriptions for the mobile apps to be running in the Play Store or App Store. So we’d rather have you keep it that way.

As for a discount on Comic Connect, we can arrange that in a different way. I will send you a $10 coupon in a PM.