If you are using this particular plug in then no updates are needed to be done by the plug in creator or on your end. This plug in uses SIM which means that no SSL or TSL is required on your website since you are using Authorize.net’s hosted secured form to process payments. Authorize.net has already updated everything to TSL 1.2 in regards to SIM on their end, so you have already been using TLS 1.2 and you don’t even know it.
