Google has a very comprehensive list of cloud services. Also, it's a good idea to include Google as your authentication mechanism due to a large number of users. In addition, Firebase is a Google company. Therefore, in the future, this process can be a lot simpler and you may have access to additional features.
If you don't already have a Google test account, you should create one.
Here are the instructions that are required to set up your Google+:
IonicFirebaseTest, since Google ...