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Merge bitcoin/bitcoin#27225: doc: document json rpc endpoints

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65e3abcbf2b9e818f3b9f1ba35f3cfe7df5e3811 doc: document json rpc endpoints (willcl-ark)

Pull request description:

  fixes #20246

  This documents the two JSON-RPC endpoints available, details when they are active, specifies when they can or must be used, and outlines some known behaviour quirks.

ACKs for top commit:
  fanquake:
    ACK 65e3abcbf2b9e818f3b9f1ba35f3cfe7df5e3811 - Seems fine. Can be improved if need be.

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doc/JSON-RPC-interface.md
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@ -5,6 +5,41 @@ The headless daemon `dashd` has the JSON-RPC API enabled by default, the GUI
option. In the GUI it is possible to execute RPC methods in the Debug Console
Dialog.
## Endpoints
There are two JSON-RPC endpoints on the server:
1. `/`
2. `/wallet/<walletname>/`
### `/` endpoint
This endpoint is always active.
It can always service non-wallet requests and can service wallet requests when
exactly one wallet is loaded.
### `/wallet/<walletname>/` endpoint
This endpoint is only activated when the wallet component has been compiled in.
It can service both wallet and non-wallet requests.
It MUST be used for wallet requests when two or more wallets are loaded.
This is the endpoint used by bitcoin-cli when a `-rpcwallet=` parameter is passed in.
Best practice would dictate using the `/wallet/<walletname>/` endpoint for ALL
requests when multiple wallets are in use.
### Examples
```sh
# Get block count from the / endpoint when rpcuser=alice and rpcport=38332
$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getblockcount", "params": []}' -H 'content-type: text/plain;' localhost:38332/
# Get balance from the /wallet/walletname endpoint when rpcuser=alice, rpcport=38332 and rpcwallet=desc-wallet
$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getbalance", "params": []}' -H 'content-type: text/plain;' localhost:38332/wallet/desc-wallet
```
## Parameter passing
The JSON-RPC server supports both _by-position_ and _by-name_ [parameter