ChatGPT Plus is a premium subscription service offered by OpenAI, but it can only be accessed through the WildCard platform. To use the one-click upgrade feature, you need to have a WildCard virtual card account. Here's a step-by-step guide on how to upgrade to ChatGPT Plus using WildCard:
**Step 1: Register and Login to WildCard Account**
Go to the WildCard website at leixue.com/go/wildcard and register or log in to your account. You can use the link or invitation code