# Missing \`key\` type in group\_channel:changed documentation

**URL:** <https://community.sendbird.com/t/missing-key-type-in-group-channel-changed-documentation/5250>\
**Category:** API\
**Tags:** group-channel\
**Created:** [August 3, 2022, 3:22pm UTC](https://community.sendbird.com/t/missing-key-type-in-group-channel-changed-documentation/5250 "2022-08-03T15:22:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![david](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/david/32/1901_2.png) [@david](https://community.sendbird.com/u/david)\
**Post date:** [August 3, 2022, 3:22pm UTC](https://community.sendbird.com/t/missing-key-type-in-group-channel-changed-documentation/5250/1 "2022-08-03T15:22:26Z")

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Hi,

I received the following `changes` payload in the `group_channel:changed` webhook:  
`"changes":[{"key":"channel_type","new":10,"old":9}]`

The [docs](https://sendbird.com/docs/chat/v3/platform-api/webhook/events/group-channel#2-group_channel-changed) don’t mention this property so I don’t know what it is! And also, I’m getting json decoding errors because they’re ints instead of strings.

Please help!  
Thanks

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<div class="post-metadata">

**Author:** ![Tyler](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/tyler/32/810_2.png) [@Tyler](https://community.sendbird.com/u/Tyler)\
**Post date:** [August 4, 2022, 6:00am UTC](https://community.sendbird.com/t/missing-key-type-in-group-channel-changed-documentation/5250/2 "2022-08-04T06:00:58Z")

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Hi @david,

In this instance, it’s stating that the `channel_type` changed from 9 to 10, which means it went from a Public Group Channel to a Public Super Group Channel.

I agree that this data is not provided in our docs and I will work with our team to try and make this a bit more comprehensive. I would say that you should not expect the new/old values to be a string or an int as there are scenarios where it could be either depending on the key.