Trading 212 API error code
Trading 212 API error: Failed validation
What does Failed validation mean on the Trading 212 API?
The order request failed validation. Trading 212's reference gives these words as the description of the 400 response on the order placement and order cancellation endpoints.
Risk warning: CFDs and spread bets are complex instruments and come with a high risk of losing money rapidly due to leverage. You can lose money on these products, and each provider publishes its own loss figure under FCA rules. You should consider whether you understand how they work and whether you can afford to take the high risk of losing your money. Automated and API trading can amplify losses through bugs, connectivity failures and runaway orders.
Independent and unofficialdocs.trading212.comchecked
How do I fix Failed validation?
Check the request body against the endpoint's reference. The page gives no further detail.