Repository Contract Approval

Hi all,

We have a requirement where the client needs the contract to go through an approval hierarchy (internal: departments or external: Supplier).

We think this requirement could be covered using repository contracts, but there is no actual document to explain the whole process.

The questions is: How can we allow the system <using AME> to get the repository contract approved by internal parties; internal department users & also the external party supplier user?

i.e., in order for the supplier user to receive notification, what needs to be done?  define the supplier user as contact party or internal employee & give him view only access?