What are the income requirements for applying for a DTV visa using soft power Muay Thai from Ho Chi Minh City?

The application process for a DTV visa using the soft power approach in Thailand, particularly when applying from Ho Chi Minh City, requires clarification on income proof. While applicants in Hanoi may not need to prove income, it seems that HCMC often asks for it to ensure they can support themselves while training in Muay Thai. Most applicants recommend providing a simple cover letter explaining your financial situation if you are unemployed, as this is usually accepted without thorough investigation. Requirements may vary by embassy and individual circumstances.