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In OpenSea documentation is said that Collections are used to represent all the assets in a single (or multiple) contract addresses and help users group items from the same creator.

Collection has primary_asset_contracts attribute with description "A list of the contracts that are associated with this collection".

But there is neither API, neither UI solution to include additional contract address to collection. So how collection with more than one contract address can be created?

MantasFam
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    It seems to me that the docs are a bit confusing. There's no clear way how this is processed. Can I add any NFT address to the primary_asset_contracts or do I have to be the owner? This section of the docs says "many ERC-721 contracts may all belong to the same collection (dapp)". So I think it is possible. I added primary_asset_contracts and added an array of ERC721 addresses owned, minted and deployed by the same address but it doesn't seem to work.. – BonisTech Feb 08 '22 at 14:53
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    My second thought is, that it is not possible. primary_asset_contracts is only mentioned in the API docs. So I think it's an internal key OpenSea uses to create collections for the same issuer. But a collection itself only has one contract in it. – BonisTech Feb 08 '22 at 14:59
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    @JonasMerhej I have to agree with you here. Feels like docs are misleading. I tried to contact Opensea, but no answer yet. – MantasFam Feb 08 '22 at 15:01
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    This is the answer I got from OpenSea support on Discord "Not possible for now. You'll have to contact us if you want to merge contracts/collections". I then asked what if I have couple of thousands of Adresses that I want to add to a collection and this is what they answered: "You'll have to contact us through https://support.opensea.io/hc/en-us/requests/new" – BonisTech Feb 09 '22 at 21:17
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    This is the answer I got in the support ticket:

    Hi there, Thanks for reaching out. We would be able to merge collections on our end if its owned by the same creator. If you have multiple collections, we could merge it under on slug an example of a slug would be (brkfst-world); https://opensea.io/collection/brkfst-world If this is something your interested in doing please include a link to each of the collections and the slug you'd like to merge it under. Kind regards, OpenSea Customer Experience Associate

     – MantasFam May 18 '22 at 11:41

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This is the answer I got from OpenSea support:

Hi there, Thanks for reaching out. We would be able to merge collections on our end if its owned by the same creator. If you have multiple collections, we could merge it under on slug an example of a slug would be (brkfst-world); https://opensea.io/collection/brkfst-world If this is something your interested in doing please include a link to each of the collections and the slug you'd like to merge it under. Kind regards, OpenSea Customer Experience Associate

Merge into one collection can't be done using API or UI, but OpenSea can do it on their end if they are contacted.

MantasFam
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