**Legacy — V1.** This page documents the ''/v1'' WebSocket API and is retained for existing integrations. New development should use [[developers:apiv2|V2]]. See [[developers:apiv2:migrating|Migrating from V1]]. ====== Step 1: Start Your Certification ====== **Email:** [[T4.APISupport@plus500.com]] **Include:** A clear description of what your application will do. **What happens next:** - **We review your submission** to determine if the exchange needs to be involved. - **Possible exchange review** – in some cases, you may need to contact the exchange for their certification. - **Application form sent** – once all reviews are complete, we’ll email you the official application form to fill out. - **Guided setup** – once we receive your completed form, we will walk you through the setup process step-by-step.