Guide
10 min readStripe Alternatives in 2026: Fees Compared
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8 minHow to Validate a Credit Card Number
Strip spaces, check for 12 to 19 digits, run the Luhn checksum, then match the prefix to a brand. Working code in JavaScript, Python and Java, plus the errors.
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Guide
9 minBest Usage-Based Billing Platforms 2026
Stripe bought Metronome and Adyen bought Orb in 2026. The metered billing options that are still independent, with verified prices, licenses and versions.
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Guide
9 minBest Merchant of Record Platforms in 2026
Paddle, Lemon Squeezy, Polar, Stripe Managed Payments and FastSpring compared on real fees, and why merchant of record has no open source alternative.
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