Currently a licence for CCleaner for iOs can only be purchased through the Apple store.
A CCleaner Android, (or CCleaner multi-device), licence will not work on an iOs device.
It's simply the restrictive licencing practices of Apple that forces that current sparate licencing situation.
If you want a licence for CCleaner iOs then you will need to purchase a new licence from Apple.
<a href="https://apps.apple.com/us/app/ccleaner-phone-cleaner/id6450901367" ipsnoembed="true" rel="external nofollow">https://apps.apple.com/us/app/ccleaner-phone-cleaner/id6450901367</a>
*I will note that it was orignally the same with CCleaner for Android, to begin with you could only purchase that through Google Play Store, and it was only some time later that you were able to use a multi-device licence with Android.
So there is hope that the same may happen with CCleaner iOs sometime in future when/if the licencing agreements can be negotiated).
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As for cancelling your current Android subscription that will depend on whether it was purchesed from the Play Store, or from CCleaner as a multi-device licence.
You say that you originally purchased your CCleaner for Android licence through the Google Play store - so it will be Google who you are paying for annual renewal and Google who you will need to cancel that subscription with.
Here are the Google instructions on how to do that: <a href="https://support.google.com/googleplay/answer/7018481?hl=en-GB&co=GENIE.Platform%3DAndroid" ipsnoembed="true" rel="external nofollow">https://support.google.com/googleplay/answer/7018481?hl=en-GB&co=GENIE.Platform%3DAndroid</a>
You also say that you paid throught PayPal - so you should check on your PayPal account that the payment has not been set as an 'Automatic Payment' there.
If it has been then PayPal will still pay it even though you have cancelled the subscription at Google.
Here is how to check that and cancel it if necessary: <a href="https://www.paypal.com/us/cshelp/article/what-is-an-automatic-payment-and-how-do-i-update-or-cancel-one-help240" ipsnoembed="true" rel="external nofollow">https://www.paypal.com/us/cshelp/article/what-is-an-automatic-payment-and-how-do-i-update-or-cancel-one-help240</a>