php is a developer with experience on Yii1

Need a specialist with knowledge of Yii1 connection module EDO (electronic paperwork)

A little bit about us, we link in one system restaurants and suppliers, provide a system of automated purchase of products for restaurants.

What we want:
So that we can carry out paperwork within the system. That is, we need to find the EDO system (we have several options) and understand the integration with them. We, as a system, need to mediate between restaurants and suppliers (i.e., that documents are exchanged through us, not directly).
For example, the restaurant ordered products, the order went to our system supplier. The supplier collected the order and sent confirmation to the customer. At the same time, we (the system) left a request to the EDO to form a document, which then the supplier and the client can download.
Ideally, that the restaurant and the supplier for these documents do not pay anything (for example, we as a system, take a package for 10,000 documents and everything goes at our expense).

Youll need to help you choose your system and implement their APIs. We can speak in more voice, if you find the work interesting.
On payment we agree, you can go by the hour, you can fix, choose a convenient format.
The code is in a rather deplorable state (legacy), but the team has a developer who designed the system and knows every element and new developer who has already immersed himself in the system, help to understand.
We also consider long-term cooperation if we like each other.