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- Why did customers get the error "PayPal cannot process your payment. Please contact the merchant to solve this issue"?
- What are the IP addresses for Live PayPal servers?
- Why did I get API error code 10002?
- How do I create a sandbox test account?
- How do I convert my PEM format certificate to PKCS12 as required by the Java and .NET SDKs?
- What are PayPal Pay Later offers?
- How do I accept credit cards using the guest checkout option?
- What is PayPal Invoicing and how does it work?
- Where can I find test credit card numbers?
- How do I create a discount code or coupon code for my PayPal buttons?
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