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You got a cURL error 6 message - Couldn't resolve host.
Version 7.10.x of cURL has a known bug that triggers a curl_exec 6 error. If you use the most recent version of cURL, check your host's ability to find the IP address of a host using DNS.<br/></p></section>

Why did I get "curl_exec error 6" with the PHP SDK?

Errors/SDK Errors

You got a cURL error 6 message - Couldn't resolve host. Version 7.10.x of cURL
has a known bug that triggers a curl_exec 6 error. If you use the most recent
...

Why did I get "curl_exec error 6" with the PHP SDK? | PayPal IN

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Why did I get "curl_exec error 6" with the PHP SDK?

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