Hi @glormy
I noticed that you are not using Shopify as your Ecommerce platform for your shop. Are you thinking of moving to Shopify in the near future? Here in the Shopify Community, we can only help with queries related to Shopify stores.
With regard to the Shopify platform, I am not familiar with NTN, however I am happy to suggest some other third-party payment providers for your region instead of 2Checkout. You’ll need to use one of the payment providers listed here at this page. As they are third party, I wouldn’t be able to advise if they would require a NTN, but you could always contact some of them directly for further clarification on this.
Once you find once that suits your business needs, you can sign up and create an account with them. You can also check out our help doc on Configuring third - party payment providers so that you can connect the payment provider to your store.
I was having a look at your store and noticed you don’t have an ‘About Us’ page. Have you considered adding one? We find customers find these great to get to know more about you. Our merchants find this blog on How to Write an About Us Page very useful if you wanted to have a look! I hope this was helpful.