Frequently Asked Questions on buyers, suppliers | OEM India. As a buyer, you should use IndiaMART Payment Protection to pay to sellers because: Seller receives payment only after you receive the goods.Purchase without worrying about getting the wrong product after payment.Purchase from any seller across India with confidence.Get a refund if you receive wrong product.Get all the above benefits free of cost. The invoice should be shared directly from seller to buyer & Oemindia Payment Protection. Oemindia Payment Protection is an intermediator & will not provide any invoice. No, we currently don’t support milestone-based transactions, the entire payment needs to be paid upfront before the transaction moves forward. In case the transaction warrants milestone payment, each milestone will have to be created as a new transaction on the platform and payment will be released accordingly to the seller.