Implementation of opencart 1.5

I'm looking for a programmer who can create a payment order signature in the 1C UTP BAF system (8.3.19.1529) Currently, we have an API module connected to PrivatBank - we can view the statement in real-time - we can create a payment order and send it to PrivatBank (unsigned) Need to Create a module in which each bank account will be connected to the KEP key and password from PrivatBank Using the libraries provided by PrivatBank ---------------------------------------------------------------------------- Message from PrivatBank technical support Documents can be signed using, for example, the SmartID API. You can also use the IT library, which can also apply signatures to documents SmartID API: https://acsk.privatbank.ua/arch/docs/SmartID.pdf IIT Library: https://eu.iit.com.ua/ Choose the type of library and you can download the description. For example, the description for JavaScript: https://iit.com.ua/download/productfiles/EUSignJavaScritAppendixJ.doc» [ Only KEP signatures are supported, for example, SmartID, connection description to the SmartID API: https://acsk.privatbank.ua/smartid» To solve this task and apply KEP (qualified electronic signature) to payment orders on your side (in the BAS system), the bank offers to use ready-made tools and libraries that integrate into your software.