Open catalog Interface in PR and PO

Hi,

I need help to setup OCI (Open catalog Interface) in PR and PO.

Requirement:

Whlie creating PR/ PO, user can select item from vendor catalog. The catalog should be opened and the required items can be selected. We have the data to login into vendor's portal for catalog information.

Please tell me the configuraitons to be done for this requirement in MM.

Note: We don't have SRM. The requirement is to be achieved in MM only.

Thanks in advance......