Procountor APP missing upload attachement

Hello to all
We are using Procountor tools for our workflow there is one missing tool that would be nessesary to automate billing that is uploading attachments to receipts. there is api to do that but in make.com the authentication is not so strait forward. all the other functions are found in the tool that is all ready made. so who is responsible of developing procountor part of the modules in make.com. it would be nice to send attachments to receipts/ledger receipts from make.com with fileupload.