• braintreepayments.com — Credit Card, Paypal, Venmo, Bitcoin, Apple Pay,… integration. Single and Recurrent Payments. First USD 50,000 free
  • taxratesapi.avalara.com — Get the right sales tax rates to charge for the close to 10,000 sales tax jurisdictions in the USA. Free REST API. Registration required
  • currencylayer.com — Reliable Exchange Rates and Currency Conversion for your Business, 1,000 API requests/month free
  • vatlayer.com — Instant VAT number validation and EU VAT rates API, free 100 API requests/month
  • fraudlabspro.com – Help merchants to prevent payment fraud and chargebacks. Free Micro Plan available with 500 queries/month.

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