> For the complete documentation index, see [llms.txt](https://docs.vebetterdao.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vebetterdao.org/developer-guides/reward-distribution/javascript.md).
# JavaScript
Setup a lambda function or an endpoint that will send the B3TR tokens to the user, providing also a proof and impacts of the rewarding action.
We will use [@vechain/sdk-network](https://docs.vechain.org/developer-resources/sdks-and-providers/sdk) and [@vechain/vebetterdao-contracts](https://github.com/vechain/vebetterdao-contracts) to interact with VeBetter's `X2EarnRewardsPool` contract to distribute the rewards.
Run the following command to install the packages:
```shell
yarn add @vechain/sdk-network @vechain/vebetterdao-contracts
```
To distribute the rewards you will need 2 information:
* `Node URL`
```
TESTNET: https://testnet.vechain.org
MAINNET: https://mainnet.vechain.org
```
* Your `APP_ID` on VeBetter: create app [here](https://dev.testnet.governance.vebetterdao.org/) to obtain the APP\_ID.
Now you can distribute the reward like this:
{% tabs %}
{% tab title="Using MNEMONIC" %}
```javascript
import {
ProviderInternalHDWallet,
ThorClient,
VeChainProvider,
VeChainSigner,
} from "@vechain/sdk-network";
import { X2EarnRewardsPool } from "@vechain/vebetterdao-contracts";
function rewardUser() {
// To transfer B3TR we first need to connect to the blockchain with
// a wallet capable of signing and broadcastisting transactions
const thor = ThorClient.at(process.env.NODE_URL || "");
const provider = new VeChainProvider(
thor,
new ProviderInternalHDWallet(
process.env.REWARD_SENDER_MNEMONIC?.split(" ") || []
)
);
const rootSigner = await provider.getSigner();
// Call the VeBetterDAO smart contract
const x2EarnRewardsPoolContract = thor.contracts.load(
process.env.X2EARN_REWARDS_POOL_ADDRESS || "",
X2EarnRewardsPool.abi,
rootSigner as VeChainSigner
);
const tx =
await x2EarnRewardsPoolContract.transact.distributeRewardDeprecated(
process.env.VEBETTERDAO_APP_ID || "",
10,
address,
JSON.stringify({
version: 2,
description: "User refilled water from a sustainable source",
proof: {
image: "https://image.png",
link: "https://twitter.com/tweet/1",
},
impact: {
carbon: 100,
water: 200
}
})
);
await tx.wait();
}
```
{% endtab %}
{% tab title="Using PRIVATE KEY" %}
```javascript
import {
ProviderInternalHDWallet,
ThorClient,
VeChainProvider,
VeChainSigner,
} from "@vechain/sdk-network";
import { X2EarnRewardsPool } from "@vechain/vebetterdao-contracts";
const PRIVATE_KEY = ""
const ACCOUNT_ADDRESS_OF_PK = ""
function rewardUser() {
// To transfer B3TR we first need to connect to the blockchain with
// a wallet capable of signing and broadcastisting transactions
const thor = ThorClient.at(process.env.NODE_URL || "");
const wallet = new ProviderInternalBaseWallet(
[
{
privateKey: Buffer.from(
PRIVATE_KEY.slice(2),
'hex',
),
address: ACCOUNT_ADDRESS_OF_PK,
},
],
);
const provider = new VeChainProvider(
thor,
wallet,
false,
);
const signer = await provider.getSigner(
ACCOUNT_ADDRESS_OF_PK,
);
// Call the VeBetterDAO smart contract
const x2EarnRewardsPoolContract = thor.contracts.load(
process.env.X2EARN_REWARDS_POOL_ADDRESS || "",
X2EarnRewardsPool.abi,
rootSigner as VeChainSigner
);
const tx =
await x2EarnRewardsPoolContract.transact.distributeRewardDeprecated(
process.env.VEBETTERDAO_APP_ID || "",
10,
address,
JSON.stringify({
version: 2,
description: "User refilled water from a sustainable source",
proof: {
image: "https://image.png",
link: "https://twitter.com/tweet/1",
},
impact: {
carbon: 100,
water: 200
}
})
);
await tx.wait();
}
```
{% endtab %}
{% endtabs %}
{% hint style="info" %}
#### Sustainability Proof
Read more about the proof standard and how we expect you to provide it in the [Sustainability Proofs and Impacts](/developer-guides/sustainability-proof-and-impacts.md) section.
{% endhint %}
{% hint style="danger" %}
To be able to distribute the rewards you will need to add the PUBLIC ADDRESS of the wallet calling the `distributeRewards` function as a Reward Distributor of your app.\
\
To do so, you need to:
1\) Connect with your app's admin wallet to the governance dapp
2\) Go to your app's page
3\) Click the *cogs* button to enter the settings page
4\) Scroll down to the "Reward Distributors" section, and add the public address as a reward distributor
5\) Save changes
{% endhint %}
---
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