It is a good question.
Generally, an MVP is made for testing the product-market fit. If you have never shown your product to the customer, you would proceed only with your gut feeling anticipating the customer would need it and pay for it.
In case you haven’t registered your company, you can’t get the payment gateway in your company’s name. Hence, test the product without online payment option and keep the payment through direct bank account into your personal account for the time being, till you are sure of the product-market fit and encouraged to register your company.