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One Step Checkout
OneStepCheckout is an extension that simplifies the checkout process of your Magento store
Optty extension in Magento2 is also compatible with OneStepCheckout
2. Setup OneStepCheckout and in the "Payment Method Defaults" settings set Optty as the default payment option, to display all the payment options that provided by Optty in the top position.
Once you have completed the setup above, your users will able to checkout with Optty with any Payment Providers that you have enabled.