[Help Wanted] Update IVAC Appointment Booking Script – Encryption Changes Daily

[allex2021]

Hi everyone,

I’m looking for someone experienced with userscripts to help update a Tampermonkey script for IVAC (Indian Visa Application Center) appointment booking.

Site: https://appointment.ivacbd.com

The site uses Cloudflare Turnstile with a custom encryption system that changes every day when the server opens at 5 PM Bangladesh time. The encryption uses:

• LCG (Linear Congruential Generator) for sign-in captcha
• RC4 Stream Cipher for reserve slot captcha

I already have a working base script (1000+ lines), but it needs updates to handle the latest changes in the encryption logic and some improvements to the auto-fill/booking flow.

What I need:

1. Fix captcha encryption detection (currently failing after site changes)
2. Improve auto OTP fetch and verification
3. Optimize burst booking mode
4. Make the script adapt to daily encryption changes automatically

If you have experience with:

• Reverse engineering JavaScript
• Cloudflare Turnstile bypass
• Tampermonkey/Greasemonkey scripting
• Encryption/cipher handling

Please reach out or reply here. This is paid work, budget can be discussed.

The site is accessible Sunday-Thursday, 2 PM-5 PM Bangladesh time (GMT+6).

Thank you!

[Shakil824]

can you share your previous script? https://t.me/lazypanda824