Financials S3 integration - 3rd party software

Hi,

Our company is a developer of Account Receivables suite (invoice distribution, outstanding monitoring, dispute workflow, collection workflow, etc). We have done integrations with many ERP systems - SAP, Oracle, Axapta, etc. As a matter of fact, our potential customer is using Lawson Financials Suite S3 and asks us about the posibility to get integrated. We are doing integration in three areas:

1. Issued invoices - in case of SAP we are fetching iDoc messages using webservice
2. Customer database - customers ID, name, VAT number, telephones, e-mails, address
3. Payment status - whether an invoice is paid or not, aging, onaccount value

Could you please help us to obtain documents describing integration mechanisms - is some kind of a platform like netweaver or biztalk available for Lawson? Also, basic data formats would be mostly apreciated. I'm sure that the integration is possible, but I would not like to give promises to my customer, rather show them some ready concept to make an integration between our systems.

Thanks in advance

Kal800