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Continue to ChatQuery : I doubt you will find any service that is 100% "free" for processing your subscription fees. The best/cheapest option is probably to write the software yourself to integrate with something https://vmapp.org/query/71783/I-Doubt-You-Will-Find-Any-Service-That-Is-100-Free-For-Processing-Your-Subscription-Fees-The-Best-Cheapest-Option-Is-Probably-To-Write-The-Software-Yourself-To-Integrate-With-Something/