Validate Customer VAT at order booking

Summary:

Dear All,

We have an integration with Ministry for the AR invoice and VAT is a important part of the same. Some times orders are processed for the customers where VAT number is missed in the customer party. Then we need to udate the same and repush the integration. Can we validate at order if the VAT is present in the Customer party at order booking. E.g a groovy script etc.. I searched a lot but only got others but not releasted to customer party. Does any one have any pointers to it or a sample code.( i am not good