Yes, I try my best to give you as much information as possible.
Registration sounds like a boring, long process that does not have to do with the task: to make an acquisition. Some site registration is a long and tedious process, sometimes even as a separate step from the check-out.
You don't have to be so. When a user makes a purchase, the user typically already requests all the information necessary for registration. Websites usually request information, including name, transport and billing information, required for the transaction. Furthermore, websites usually request an email address for an email address and update the status of their order.
The only aspect of registration not covered by a standard check-out is a password.
Before users enter the checkout process, it is obviously an option for registration. Some users want to register and to see confidence if they want. When you have the option to create a password after the transaction is completed, please tell the user when you can expect the option rather than during the check-out process.