How to clear pending purchases

The other day I bought 3 in-app purchases that didn't succeed, but it seems that they are pending in my Purchase History. I've tried adding new methods that are available in my country but it still won't come through. Every time I tried downloading a new app, it won't download because it says that I have a problem with my payment methods. When I try to remove all of my payment methods, it says that there is an active subscription that requires at least one payment on file. I can't seem to get this fixed, please help. Thank you