Subscription Payments options - Authorize.net Gateway

[Holistichealth1]

I am looking for anyone to guide me on options I may have to be able to add subscription products to my shopify store. 
We are holistic health supplements - we use Authorize.net 
We do NOT use Shopify payment. 

I am struggling so hard to find a solution and not particularly keen on using something like https://konnektive.com/

Any guidance would be greatly appreciated!