We are going to get 3% of commission for each payment transaction from the merchant. We will convert crypto into fiat and send fiat money to the merchant.
3% is too high for sure, even bigger company's fee such coinpayments doesn't even reach 1% for fee on every transaction, and even bitpay just charge something like 1%.
If your purpose is to get more sales other than to get more merchants to use your service that's why you have such fees then I don't think you will succeed considering you're only new in the industry, while there are already reputed services the same as yours.