Connecting to B2B XML gateway for our B2B clients

We have successfully launched our B2C connecting via an XML gateway to our Oracle database backend. We now need a developer fluent in XML, PHP and MySQL to connect to our XML gateway for B2B users. The different is that our XML gateway uses only 5 different credentials to connect to our server to get the rates displayed and we follow different branches. Most of the scripts have been developed already but they need to be fine-tuned for our B2B portal with different credentials to connect and display rates. A sample MySQL database can be send by PM to you.