Call a PKG, Web Service, or API with the RFQ screen action button

Summary:

Call a PKG, Web Service, or API with the RFQ screen action button

Content (required):

Good Morning.

I have a big problem, we have a requirement to add external cost factors and apply the item view restriction for suppliers in RFQs (RFQs with almost 600 lines). We have a core API that does this very well (/fscmRestApi/resources/11.13.18.05/supplierNegotiations), but we need to do this before the buyer publishes the RFQ.

We don't have any events in the OIC to make the API call before it's published.

Question.:

1) Has anyone gone through something similar, if so, what's the tip?

2) Would it be possible to create some kind of call or include an option (call API) in the actions button on the RFQ screen?