The endorsement process for a UK Innovator Founder Visa involves obtaining a endorsement from an approved endorsing body. This typically includes:

1. Submitting a detailed business plan outlining your innovative business idea.
2. Presenting your plan to the endorsing body for assessment.
3. The endorsing body evaluates your business idea based on innovation, viability, and scalability.
4. If endorsed, you receive a letter confirming your endorsement, which is required for your visa application.

Each endorsing body may have specific criteria and procedures, so it’s essential to check and follow their guidelines.