# update\_token\_metadata

An entrypoint that updates LP token metadata. Also can add a new fields to an existing metadata.

### Call parameters

```pascaligo
type metadata_pair_t    is [@layout:comb] record [
  key                     : string;
  value                   : bytes;
]

type upd_tok_meta_t     is [@layout:comb] record [
  token_id                : token_id_t;
  token_info              : list(metadata_pair_t);
]
```

#### metadata\_pair\_t

<table><thead><tr><th>Field</th><th width="198.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td>key</td><td>string</td><td>Metadata key</td></tr><tr><td>value</td><td>bytes</td><td>Metadata value</td></tr></tbody></table>

#### upd\_tok\_meta\_t

| Field       | Type                                        | Description         |
| ----------- | ------------------------------------------- | ------------------- |
| token\_id   | token\_id\_t (nat)                          | Token's (pool's) ID |
| token\_info | list([metadata\_pair\_t](#metadata_pair_t)) | Token's metadata    |

### Usage

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

```javascript
const dexCoreAddress = "KT1...";
const params = {
    token_id: 1,
    token_info: [
        {
           key: "name",
           value: Buffer.from("wWBTC/TEZ LP").toString("hex"),
        },
        {
           key: "new_field",
           value: Buffer.from("New value").toString("hex"),
        },
        ...
    ],
};
const dexCore = await tezos.contract.at(dexCoreAddress);
const operation = await dexCore.methodsObject.update_token_metadata(params).send();

await operation.confirmation();
```

{% endtab %}
{% endtabs %}

### Errors

* `108` - pair (pool) with the specified `token_id` not listed.
* `402` - `sender` of the transaction is not a manager.
* `412` - non payable entrypoint (can't accept TEZ tokens during call of an entrypoint).