Help Needed: Six-Month Stay Abroad for Surgery & Wellness Program

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Hi everyone! I’m hoping someone can help because I haven’t been able to find clear answers anywhere. I’ve been offered a chance to travel abroad for a cosmetic surgery and weight-loss program, which requires me to stay for six months to complete the treatments and participate in filming. All expenses—surgeries, accommodation, meals, fitness, and activities—would be covered. I’d really love to take this opportunity, but I’m unsure what I need in order to legally stay for the full six months. Any advice would be greatly appreciated.
Thanks,
hollow knight