Need help EDI / XML

One of our customers used to send orders using the conventional EDI method. 
Now they  post all this info onto their website every few hours we log onto 
their website using user-id /password which they have provided and take 
screen prints from this website and then manually enter this info into our 
ERP system (BPCS),  for outbound documents we generate reports from our ERP 
package and then enter all this info onto the website manually, we want to 
automate this process ... any suggestions on the best way to do this will be 
greatly appreciated...

Regards,
Nazir 
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