# Testing

To test the Request Finance API with your application, you can use your “Test” API key when making requests. You can find your “Test” API key in the ["Developer" tab](https://app.request.finance/account/api-keys) in “Settings”. 

Invoices that you create using your “Test” API key will be persisted on the Sepolia Testnet (a testing network for Ethereum). You can see and interact with them in our sandbox: <https://baguette-app.request.finance/>. Use your existing credentials to access your sandbox account.&#x20;

{% hint style="warning" %}
API keys are not recommended for a live application and will be deprecated. Follow the steps in [Going Live](/going-live.md) instead.&#x20;
{% endhint %}

## Payments

To test paying an invoice or a payroll payment without spending real tokens, you can use ETH on Sepolia Testnet. You can get some using a faucet online and your wallet address.&#x20;

Make sure to create invoices and payroll payments with ETH on Sepolia as a payment method.&#x20;

Since the account that issued the invoice cannot be the account that pays the invoice, you will need to create another Request Finance account for the buyer role.

#### **Test ERC20 tokens**&#x20;

To test stablecoin payments on Sepolia, we use `FAU` as a `DAI`-pegged testnet token. You can mint some `FAU` tokens by calling use the `mint` function of the `FAU` smart contract:

* Open the `FAU` contract on Etherscan page: <https://sepolia.etherscan.io/address/0x370de27fdb7d1ff1e1baa7d11c5820a324cf623c#writeContract>
* Click on `Connect to Web3` and pick Metamask
* Metamask will ask you to connect and confirm
* Open the `4. Mint` section

<figure><img src="/files/q5iZ0meWWju2Nyh8TZAn" alt=""><figcaption><p><code>mint</code> function of the <code>FAU</code> smart-contract</p></figcaption></figure>

* Fill up the `to (address)` field with the address of your wallet (you can find it on top of your Metamask window)
* Insert `10000000000000000000000` for the `value (uint256)`. This is equivalent to `10000 FAU` (with 18 decimals after that).
* Click `Write`, confirm the transaction in Metamask

💡 If you don’t see your `FAU` on Metamask:

* Click on “Don’t see your token? Import tokens”
* Click on “Add custom token” and paste `FAU` contract address: `0x370de27fdb7d1ff1e1baa7d11c5820a324cf623c`&#x20;

## Postman Collection

You can find a Postman collection of the Request Finance API [here](https://www.postman.com/request-finance/workspace/request-finance-api-public/documentation/24913360-b5105a65-a6bd-4247-b3b1-ed60e5c8f5cb). Feel free to use it to test the API.&#x20;

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