You may need your national ID card for online transaction but unfortunately, government is not giving the plastic ID card to people.
Now, the solution for you is to simply arrange your NIN details in form of an ID card and print it out on plastic in a business center. Then scan or snap the card and use. This is the way I did mine and I have been using it online. I have done it for many people too.
You may be wondering how you can arrange your NIN details in form of ID card. The truth is that, you will need a designer who will design your NIN details in form of ID card. You can now copy that design and print it out on plastic in a business center. That is all.
For more details on how you can do it visit http://naijaprops.com.ng/2022/02/14/make-your-national-id-card-design-and-print-it-on-plastic/