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Source: OpenAI Help Center, Connecting custom MCP servers in ChatGPT. ChatGPT connects to LeadLex as a custom connector that points at the remote MCP server.
1

Open connector settings

Custom MCP servers are available on ChatGPT Business, Enterprise and Edu, on ChatGPT web. On Business, only workspace admins and owners can add them. In ChatGPT, go to Plugins, select the plus button and choose Add custom MCP server. Developer mode is not needed.
2

Create the connector

Use LeadLex as the name and enter this URL under Connection:
3

Choose OAuth

Select OAuth as the authentication method. LeadLex supports dynamic client registration, so ChatGPT does not need a pre-created client id. Tick I understand and want to continue, then select Create as a plugin and review the tools ChatGPT found.
4

Approve access

Sign in to LeadLex and approve the consent screen.
In a new chat, enable the LeadLex connector and ask something like “Show me my open deals”.
OAuth is the right choice for ChatGPT. Tools that act on your own LinkedIn account or mailbox need a signed-in user and do not work with an API key.