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To resolve the curl error issue, can you check if you have “openssl-pkcs11 (aka engine_pkcs11} package installed?
Also, instead of using the “relative path” can you try using the “absolute path” for the certificates?
You should also try using our sample codes since they will be a helpful guide for you. To access sample code, login to your Visa Developer account and from your dashboard go to your project app and on the left side tab click on Sample Code. Sample Code will be available for download from there.
Please let me know if you have any questions or require any assistance getting started with the Visa Developer APIs. I'm happy to help.