Implementation of electronic invoicing and electronic reporting

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We are getting couple requirements with electronic invoicing and reporting from couple of countries. We are from recipient side(buyer side only) of electronic invoicing and have invoices to pay flow with c@c deployment. We see payables leverages CMK for electronic invoicing integration either with partners directly or through service providers. We are not seeing any comprehensive guidance or deployment stories to understand how much this product could help to successfully implement this process. We would appreciate if you could share some white papers or reference documents or any materials that would give some confidence to commit to start