Drop shipping and GST within India.

Drop shipping and GST within India, but the Supplier is based in Unknown State but in India only and our website or the GST is registered for Maharashtra. I publish the products available on their App to my website. If order is received on my website, buyer gets a soft copy mail to its email Id having the GST amount charged against the products inclusive. After receiving order i will place an order on the Supplier's app and pay the wholesale amount or the purchase amount. Supplier will deliver the product to my customer without any invoice only the Product will be delivered. If the product has to be delivered within maharashtra with Gst of 5% then I will be invoicing cgst 2.5% and sgst 2.5%. But if the order is placed out of Maharashtra then will i be invoicing gst 5% will it be igst5%. Right? For e.g. product from supplier is for Rs.300+70(Shipping charges) inclusive Gst charged by supplier.. And if i am selling the product on my website at 10% extra then I will get Rs.470 from my customer through payment gateway. How will be the invoicing process to supplier and to the customer and GST invoicing? Will i earn profit in GST transition.