Create raw payload from rpc client

[whalelephant]

Hi,
I would like to get feedback on a proposed method for Client such that
client.create_raw_payload(AccountId, Call) returns the payload to be signed.

The reason is so that the payload may be signed by other signers (maybe not in the XtBuilder and use this or other tools to create uncheckedExtrinsic.

[ascjones]

Sounds like a good idea, though perhaps it would be on the XtBuilder API?

[whalelephant]

From my understanding Xtbuilder currently accept a signer type with trait Pair implemented for signing. The proposed method is so that the only requirement for creating the raw payload is the pubkey / account ID

[ascjones]

Yeah you're right. Potentially could make signer Option<P> then provide an XtBuilder impl with P = (). But feel free to make a PR with your idea, and we can see how it looks.

[whalelephant]

ok cool, I don't have permission to push my working branch for the PR at the moment. Please help. thanks!

[ascjones]

If you have a fork you should be able to push to that and create a PR from there

[ascjones]

Closed in #83