I'm using this library to interact substrate blockchain https://github.com/sublabdev/substrate-client-swift

Can anyone explored before tell me how to create and use signed and unsigned payload?

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I didn't know there is a swift library thanks for sharing. I haven't use it yet but in their documentation: Extrinsics Service there are examples about it.

If it can help to understand the construction, here you can see the equivalent of your question using subxt: Create a signed transaction using a signature and unsigned_transaction

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