Automate Phone number for customers

[Integra]

We are getting orders from Mirakl but they don't provide customer's phone number. 

Fedex requires phone number so we have to input our phone number for EACH order manually.

Is there a way to automate and populat all orders with a specific phone number so we can ship?

Anyone having the same problem?

Comments are really appreciated, the task of adding manually is time consuming and completely unnecesary

Thanks