Hello Ashik,
It seems to be a problem with your PHP configuration.
Please check answers here:
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https://stackoverflow.com/questions/21114371/php-curl-error-code-60The workaround for you is to use just HTTP by our API method setUseHttp, but HTTPs access is preferable way:
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https://pdfcrowd.com/api/html-to-pdf-php/#set_use_http