I would Highly recommend Pabbly Subscriptions
I am also running a subscription-based business :)
For my business, I have been using Pabbly Subscriptions - Recurring Billing & Subscription Management Software
for 6 months, and it automates the entire subscription lifecycle.
I have tried & tested a few different billing software also, but I found Pabbly Subscriptions is the best among them. It manages all my one-time and recurring payments, customer communication, generates invoices, failed transactions and much more.
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Hey, you have not mentioned in the question which type of business you have. Please, let me know which type of products or services you are selling. According to which I can suggest a suitable software for you.