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Paypal Sandbox account with API Signature Asp.net C# failed

I am using Paypal Sandbox account with Soap API Signature Asp.net C#

The same code works for me on live Paypal account, but it does not work in the sandbox.

Paypal sandbox throws error

The request was aborted: Could not create SSL/TLS secure channel

Is there any help please

This usually happens if you try to connect to api.sandbox.paypal.com without supplying an API certificate. Try using api-3t.sandbox.paypal.com instead.

Since you did not say what Urls you are using, we can't say right or wrong.

Here are the Urls for PayPal.

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