Visit Openrouter.ai. Open an account with your Google Account or Email Address.

Click on your photo/icon in the upper right corner and go to Credits.

$5 is enough to get you started. Be aware that OpenRouter takes a cut of your credits. This is how they make money.

Once you have paid for credits, click on Keys in the same menu.

Click Create Key. Name the key “Raptor Write” or “FFA” or whatever and then copy the key to your document. DO NOT LOSE THIS. This is the only chance you have to copy this key.

Quick link ➡️ OpenRouter: https://openrouter.ai/settings/keys