> For the complete documentation index, see [llms.txt](https://faq.finerymarkets.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.finerymarkets.com/api-reference/troubleshooting-errors/error-14.md).

# Error 14

Error 14 Invalid signature may occur when sending a REST request or connecting a WebSocket.  

* Check that you send a payload as a string.
* Check the signature is correct.

Use the following tests to check the correctness of your signature:

**REST Signature test**

```
// Generate your key and secret 
key = "your API key"
secret = "your API secret"

method = "add"
content = {
        "nonce": 49856723467362345, // Unique within a 2-min window per API key
        "timestamp": 1628489110490, // Put current timestamp
        "instrument": "BTC-USD",
        "clientOrderId": 1,
        "size": 1,
        "side": "ask",
        "type": "MarketIOC"
}
```

String to be signed: 

`add{"nonce": 49856723467362345, "timestamp": 1628489110490, "instrument": "BTC-USD", "clientOrderId": 1, "size": 1, "side": "ask", "type": "MarketIOC"}`

The correct signature should be exactly the same: 

`xvWE5m9bLUOx6TubJsXbnHPfdmYGvlbma2kuRPma0smOq47yRsG4LCak/hozAiQq`

**Websocket signature test**

```
key = "RlZ4sKsHSr5zmYKIzbtf772J9y9gx8nekd8COrawI5V"
secret = "cZpZ1vwzOaXuiONfIQVg8h6za97FoHhrwwgoSCNwDAR"

content = {"nonce": 49856723467362345, "timestamp": 1628489110490}
```

String to be signed:

`{"nonce": 49856723467362345, "timestamp": 1628489110490}`

The correct signature should be exactly the same:

`KCn9rlqILiifROYfgpGmRtvgBzSCJa/2KJ31oPKbcyE6D+BaTVfFMXo8kDwQtBC/`