Trading is only available with a set of Commercial API keys. You can apply here - https://developer.schwab.com/products/trader-api--commercial

Order Impact/Trade preview is not supported.

All connected accounts planning on placing trades must have ThinkOrSwim enabled. See this guide - Schwab Trading: Enabling trade access via ThinkOrSwim

Guide to Apply for Schwab Keys:

1. Register on Schwab: Register here.
2. Request Access:

• Accounts and Trading - Commercial Production
• Market Data - Commercial Production
• Use callback url: https://connect.snaptrade.com/oauth/callback

Send Us the Keys: Please send the keys in a secure note (e.g., via Bitwarden).

Querying Frequency:

Orders Endpoint: ****Not more than once per 30 seconds : https://docs.snaptrade.com/reference/Account Information/AccountInformation_getUserAccountRecentOrders