Follow all the steps and add your all billing details there.
Make sure the google map portal is paid for your google place API.
After adding billing details get google map keys and Google Place API keys for your project.
Make sure to enable both the key otherwise it will not work.
Open the Android manifest file and add it to there.
For IOS open ios folder inside runner, folder add a key on swift file.
In "FoodZone" application we have used google place api for search the current place on which you want to fine the stores or restaurants.
Also we have used it for adding new customer address through the place api.
Without adding billing details on google map console you won't be able to use the google map key on admin panel. You won't be able to add store address. Also, you won't be able to use the place picker and google direction API on mobile application.
You just need to go on the google map console. Select the project which you created there and add your billing address.
* Add Billing Address on Google Map Console
Add place picker api to your dart project.
For using place picker in your application you need to add place picker api on your flutter dart project.
Open your project on IDE and go to lib -> helper -> constant.dart -> KEYS
Now clean and build your project using flutter clean and flutter doctor command after saving it.
Run your project on iPhone or Android platform.