Per docs https://github.com/phemex/phemex-api-docs/blob/master/Public-Spot-API-en.md#amend-order this should work from ccxt (trying to amend the spot order): ``` cosnt ex = new ccxt.phemex({..}); ex .privatePutSpotOrders({'symbol':'BTC/USDT', 'orderID':'x123'}); ``` but throws exception of `API Signature verification failed.` . all other methods (post/get) works, but not PUT methods. Neither in your examples of Node.js I've found any example.