# Installation and Configuration

## Preconditions

Python 3.10, 3.11 or 3.12 is required.

Recommendation: Before installing the package, create a virtual environment and activate it.

## Installation

The package is hosted at the Python Package Index (PyPI) and can be installed using `pip install edutap.wallet_google`.

## Configuration

In order to create new Wallet Classes and Wallet Objects you need to have a Google Developer account and a Google Wallet API project.

To authenticate with the Google API, you need to provide a credentials file and an issuer ID.

To get the file and the issuer ID, follow the Steps 1 to 4 at [Google Developer instructions for Wallet API access](https://developers.google.com/wallet/generic/web/prerequisites).

In the process you will download a JSON file with the credentials.
It is expected in the filesystem, readable by the program.

Point the environment variable `EDUTAP_WALLET_GOOGLE_CREDENTIALS_FILE` to its location.

Example:

```bash
export EDUTAP_WALLET_GOOGLE_CREDENTIALS_FILE=/home/example/google_credential_file.json
```

In the process you will get an Issuer ID.
It is displayed in the Google Pay and Wallet Console right beside the heading *Google Wallet API* as *Issuer ID* (the term might be translated to your according to your language settings).

Copy the value and point the environment variable `EDUTAP_WALLET_GOOGLE_ISSUER_ID` to it. Example:

```bash
export EDUTAP_WALLET_GOOGLE_ISSUER_ID=1234567890123456789
```