This test purchase was cancelled because it was not acknowledged. You should ensure all purchases are acknowledged so they are not subject to refunds.
Unity IAP 3.0.1
No confirmation of purchase occurs. What to do?
This test purchase was cancelled because it was not acknowledged. You should ensure all purchases ar
Ensure you check Consume purchase for the button properties if you are using Codeless IAP.
How can I check purchase?
Sorry I don’t understand the question. You first need to check your IAP Button properties in the Unity Editor Inspector, ensure that the Consume checkbox is selected (if you are using Codeless).
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How about not using Codeless IAP. I’m not using codeless IAP but I receive the cancellation email.
Are you returning Complete from ProcessPurchase? Please provide steps to reproduce.
Someone on Stack overflow suggested that, if you are a TESTER, this behaviour is normal, cancellation occurs after 5-7 minutes of purchasing IAP or subscription.
Check out the answer: android - Google Play Billing (testing mode): why my purchase is automatically canceled - Stack Overflow
Hope it helps
Correct. However, did you receive the email as mentioned by the OP “This test purchase was cancelled because it was not acknowledged. You should ensure all purchases are acknowledged so they are not subject to refunds.” If not, they might be seeing something different, I don’t believe ever seeing that email.
Yes, I did receive these emails. So I tried implementing Validating Receipt through CrossPlatformValidator. But even then was receiving such a cancellation email (“This test purchase was cancelled because it was not acknowledged. You should ensure all purchases are acknowledged so they are not subject to refunds.”). As I am also testing on Closed Alpha on Playstore.
Interesting. So these were subscription purchases that were cancelled? Do consumables stay put? Are you using Codeless IAP or Scripted? This is the message I receive from Google “Thank you. This is a test subscription. It will recur according to this schedule. You have not been charged.”
I have implemented Scripteed IAP, but still receiving a Cancellation email from Google. No, they are not subscriptions. They are Non-consumable and consumable IAPs.
I have an idea to confirm this issue, try purchasing the same IAP again and again as a tester. If after 6-10 IAP purchases, the cancellation starts, then it can clarify that it is by Google.
In my case, after the 10th IAP purchase. Cancellation started from the 11th consumable IAP purchase.
Suggesting this because my code is perfectly alright. Everything is working well.
If you don’t get any cancellations, then I have to look again into the issue. 
I think they might be doing cancellations so that developers can test Non-consumable IAPs again and again and track down the issue.
I suspect that Google is limiting your purchases after a certain number during testing. Use a different tester account to confirm. I always use several tester accounts, and several similar products for testing. Compare your code to the Sample IAP Project v3 here Sample IAP Project
I tried with different account and it worked completely fine, no cancellations.
Thank you so much for your time and consideration. 
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