> For the complete documentation index, see [llms.txt](https://docs.derupt.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.derupt.io/latest/contracts/.derupt-ext-trait.md).

# .derupt-ext-trait

### More Details Coming Soon

*(sample extensions coming soon)*

```
;; title: derupt-ext-trait
;; version: 1.3.1
;; summary: Derupt Extension Trait Contract

(use-trait cryptocash-token-trait 'ST1ZK4MRVTQQJMVAAJQWBV2WPQ87QV2851YCTHD7X.cryptocash-token-trait.cryptocash-token)
(use-trait cryptocash-core-trait 'ST1ZK4MRVTQQJMVAAJQWBV2WPQ87QV2851YCTHD7X.cryptocash-core-trait.cryptocash-core)
(use-trait sip-009-trait 'ST1ZK4MRVTQQJMVAAJQWBV2WPQ87QV2851YCTHD7X.sip-009-trait-nft-standard.sip-009-trait)
(use-trait sip-010-trait 'ST1ZK4MRVTQQJMVAAJQWBV2WPQ87QV2851YCTHD7X.sip-010-trait-ft-standard.sip-010-trait)
(use-trait sip-013-trait 'ST1ZK4MRVTQQJMVAAJQWBV2WPQ87QV2851YCTHD7X.sip-013-trait-sft-standard.sip-013-trait)

(define-trait derupt-ext
    (
        (update-ext-owner
            (principal)
            (response bool uint)
        )

        (update-ext-metadata
            (
                (optional (string-ascii 24))
                (optional (string-ascii 256))
                (optional (string-ascii 256))
            )
            (response bool uint)
        )

        (exec-ext-func 
            (
                (optional (list 10 
                    {
                        stringutf8: (optional (string-utf8 256)), 
                        stringascii: (optional (string-ascii 256)), 
                        uint: (optional uint), 
                        int: (optional int), 
                        principal: (optional principal), 
                        bool: (optional bool),
                        buff: (optional (buff 34)),
                        proxy: (optional (buff 2048)),
                        cryptocash-token-contract: (optional <cryptocash-token-trait>),
                        cryptocash-core-contract: (optional <cryptocash-core-trait>),
                        sip-009-contract: (optional <sip-009-trait>),
                        sip-010-contract: (optional <sip-010-trait>),
                        sip-013-contract: (optional <sip-013-trait>)
                    }
                ))
            )            
            (response bool uint)
        )
    )
)
```

{% hint style="warning" %}
Extension argument `ext` must follow the`.derupt-ext-trait` function schema
{% endhint %}

{% hint style="warning" %}
Extension execution is done per the `exec-ext-func` function, which takes `extras` as an argument.  Extension(s) contract calls are made in the `.derupt-core-yyyymmdd`.&#x20;
{% endhint %}

{% hint style="warning" %}
Users can have only 1 extension enabled, per key function call.  eg..

* can have 1 `ext` allowed in `gift-message`&#x20;
* can have 1 `ext` allowed in `send-message`
* can have 1 `ext` allowed in `like-message`&#x20;
* can have 1 `ext` allowed in `dislike-message`
* can have 1 `ext` allowed in `favorable-reply-message`
* can have 1 `ext` allowed in `unfavorable-reply-message`

(note: users can change the enabled extension over time)
{% endhint %}


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