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Just Check my last update : https://ecency.com/hive-139531/@bambukah/hive-php-lib-update-new

At this time, just the "raw style" allow you Buy/Sell, but you can read without Raw style

Okay, and how to sign a transaction with HE, where to enter the key in the code / your library? I would appreciate a line of test code with an example sale or purchase transaction.

The official doc for HiveEngine is here : https://github.com/hive-engine/hivesmartcontracts-wiki/tree/main
But I'll try to write an example for Hive-PHP-Lib soon. It will be better.

Also, I'll write some "shortcuts" functions for this kind of actions. Imagine a function like buy($user, $activeKey, $token, $quantity, $price). It will be cool :)

I look forward to it :) Do you think you will succeed next month? ;)