It is possible to extend the trial period before your trial expires. For this and other similar problems, it is best to contact Google Billing Support <https://support.google.com/cloud/answer/6293765?hl=en&ref_topic=7106112#> directly.
After clicking the “upgrade” button, it becomes too late to revert, and one cannot enjoy the free trial status any more. If you would like to still profit from the remaining credit you initially received when signing for the free trial, reverting to that status is not necessary. Your remaining credit is still there and you may continue using whatever amount is left. This remaining credit from the trial period gets automatically applied to your account. The amount is accessible and still free for you. To avoid charges, you can disable billing for your project. Many services cannot be enjoyed any more after disabling billing, but you are safe from any further charges, as long as you prefer to still maintain this situation. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/1a6c6168-a99f-4a91-918b-859bea9b5edb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
