Hi vali panahi, I've added you to my PayPal account as a developer. Use this information User ID: <removed>Temporary password: <removed> to log in. Then change your password. Use PayPal's integration instructions to complete PayPal Checkout integration (https://developer.paypal.com/docs/limited-release/paypal-commerce-platform/business/accept-payments/setup-payments/) and let me know when you're done.
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