Help to find out the connection setup whatsapp number to Meta

Hi, I have almost done a successful connection to use Whatsapp API. But I’m stuck in the final step.

The connection Make to Whatsapp is done. But I guess something is missing in the Meta side.
The new phone number is set in the Whatsapp platform. But I think this is the thing.

See, Status is pending:

As you see it looks like I need to send the certificate , maybe via postman. (not sure)

here is the docs that explain that. and the image.

This is the complete post instruction I found.

**Have anyone have passed from this, in order to guide me? **
**Is sending the certificate with postman possible as last step? **
dumb question: where I can find my webapp hostname and webapp port

I really appreciate any help on this.
thanks