# mint

Add token to protocol and mints related yToken `token` for caller.

{% hint style="info" %}
Underlying token must be approved before calling this operation for an `amount`
{% endhint %}

{% hint style="warning" %}
The `yToken` contract expects that underlying token info of `tokenId` is updated by calling [PriceFeed.getPrice](https://yupana-finance.gitbook.io/yupana-document-portal/developer-space/pricefeed-contract/getprice) and [updateInterest](https://yupana-finance.gitbook.io/yupana-document-portal/developer-space/ytoken-contract-methods/updateinterest) in the same block **before** this contract method.
{% endhint %}

### Types

```pascaligo
type yAssetParams       is [@layout:comb] record [
  tokenId                 : nat; // yToken token Id
  amount                  : nat; // amount of underlying token to send to Yupana
]
```

| Parameter | Type | Description                                       |
| :-------: | :--: | ------------------------------------------------- |
|  tokenId  |  nat | yToken identifier                                 |
|   amount  |  nat | amount of underlying token to be sent to protocol |

### Usage

{% tabs %}
{% tab title="🌮   Taquito" %}

```typescript
const tokenId = 0; // or new BigNumber(0) or "0"
const amount = 10_000_000; // or new BigNumber(10_000_000) or "10000000"
const yupana = await tezos.contract.at(yTokenAddress);
const proxy = await tezos.contract.at(proxyAddress);
const batchArray = [
      {
        kind: "transaction",
        ...yupana.methods.updateInterest(tokenId).toTransferParams(),
      },
      {
        kind: "transaction",
        ...proxy.methods.getPrice([tokenId]).toTransferParams(),
      },
      {
        kind: "transaction",
        ...yupana.methods.mint(tokenId, amount).toTransferParams(),
      },
    ];
const batch = await tezos.wallet.batch(batchArray);
const operation = await batch.send();
await operation.confirmation();
```

{% endtab %}

{% tab title="🐍   Pytezos" %}

```python
token_id = 0
amount = 10_000_000
yupana = ContractInterface.from_michelson(code) # or client.contract(contract_address)...
proxy = ContractInterface.from_michelson(prx_code) # or client.contract(prx_contract_address)...proxy = ContractInterface.from_michelson(code) # or client.contract(contract_address)...
call = pytezos.bulk(
        yupana.updateInterest(token_id),
        proxy.getPrice([token_id]),
        yupana.mint(token_id, amount)
    ).autofill().sign()
opg = call.inject()
```

{% endtab %}
{% endtabs %}

### Errors

* `token/cant-get-contract-token` - FA12 token contract address does not contain `transfer` entrypoint from FA12 interface.
* `token/cant-get-contract-fa2-token` - FA2 token contract address does not contain `transfer` entrypoint from FA2 interface.
* `underflow/liquidity - reserves` - liquidity more than reserves.
* `yToken/amount-is-zero` - passed zero `amount`.
* `yToken/need-update` - token price and interest not updated (see <mark style="color:orange;">warning</mark> above)
* `yToken/yToken-undefined` - token identifier is not assigned to any known yTokens.
