If the employee provides your customer account number at the retail counter, we will issue a tax invoice to such customer account number. If such account number is GST registered in our customer master, then we will apply tax rules for registered customer and shall charge you IGST on such invoice. Subsequently, you will be able to avail input tax credit on such invoice. However, if you are not registered under GST, we will charge CGST + SGST / UTGST of the handover location.  

In this regard, it is advisable that for you to consider issuing some document to your employees/representatives who may hand over shipments at our retail counters so that we can confirm that such person is authorised to provide your customer account number to us for credit billing purposes.