If you integrate Stripe Payment Gateway in 3rd party shopping cart & faced the problem that transaction was not happening properly & have received the following error message:

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Failed (1326035). Reason: Sending credit card numbers directly to the Stripe API is generally unsafe. To continue processing use Stripe.js, the Stripe mobile bindings, or Stripe Elements. For more information, see https://dashboard.stripe.com/account/integration/settings.
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Make the below changes in your Stripe so that Transaction gets processed: