Error when trying to use REST API to connect to PayPal Sandbox

[jasfi]

I'm trying to connect to the PayPal Sandbox REST API. This is a Nim program that uses httpclient, but there's nothing specific to Nim since this is just a REST API.

The error I get is:

Error: unhandled exception: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed [SslError]

I'm using OpenSSL 1.1.1m on Windows 10. This used to work before (last week), so I don't know why it stopped work, and whether its an issue on the client or server.

[angelleye]

I'm not familiar with Nim, but I know with PHP it's a combination of PHP, OpenSSL, and cURL versions that allow for the TLS transactions to work with PayPal.  If one of those is bad we get a very similar error.

I would check any other layers/protocols involved with making HTTP requests over Nim and see if any of them happen to be using an old SSLv3 request..??

[Nexus_Software]

Hello @jasfi,

On Windows this issue can be resolved by 

1. Downloading the file at https://curl.se/ca/cacert.pem
2. Placing the file in a folder that is in %PATH% or else in the same location as the .exe

Thank you.

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