I would recommend anyone reading this thread and feel interested on OP's offer to exercise extreme caution and common sense.
If something seems too good to be true, usually it is.
Implying OP's offer is true and he is offering these services for 150$ that would imply giving support for a significant amount of casinos for little money, which does not sound profitable in the long term. Even if it was, would not this mean we all would see an huge amount of low quality casinos to appear?
If one wants to start a casino one needs to know what one is doing and hire people to take care of security, budget, etc.
If this is just a sale for a script, then make sure to try the demo.
Use common sense.
Feel free to join my discord and ask my customers as I said i repeat for over 3 times now, you can hire me to do exclusive features or get another dev to do it, the code is well structured, and again i said there is a big casino (not crypto) using my script, im selling you the script and if i manage to add a new feature everyone would get it except if it was made for someone before exclusively