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Get Paypal Express working with OneStepCheckout and Magento 2
As of OneStepCheckout 1.2.044 you can control some aspects of additional validation for your store REST endpoints. This includes 2 types of access control for verifying AJAX requests and control access to REST endpoints via Google's invisible reCAPTCHA v3. Most commonly used against carding attacks that plague Magento 2 based stores or other attacks against your site REST endpoints.