Connect LINE (Marketplace mode)
The one-click route. It needs approved LINE Marketplace partner status first, so the wizard shows it as coming soon and defaults to Messaging API.
What it does
LINE Marketplace extensions connect through a module channel. You press one button, LINE asks an administrator of your Official Account to authorise a set of scopes, and we are attached. There is nothing to copy and nothing to paste.
The rule that shapes everything
A LINE Official Account can have only one Marketplace extension attached at a time. If another extension is already attached, you must detach it before attaching ours — the wizard checks and tells you which one is in the way.
LINE also advises against running a separate Messaging API integration alongside an attached extension. This is why our bots share one workspace-level connection instead of each owning the account: the second bot would otherwise be impossible.
Why it is not available yet
Becoming a Marketplace partner with a module channel is a corporate application to LINE, not a feature we can ship. Until that application is approved, APP_CONFIG.marketplaceMode stays false and the wizard offers Mode B. Everything else about the product is identical either way.
What to do instead
Use Messaging API mode. It takes about 90 seconds and gives you the same result.