GPT Team promo code via LINE channel (method found elsewhere)

Getting discounts by sending keywords through third-party channels only works if the other party is genuinely official or an authorized partner. Otherwise, you may end up wasting your time and even risk leaking your account information.

Try it first with an account you don't use much and that isn't linked to any important payment methods. Once you've confirmed the discount actually shows up on the subscription bill, then consider using your main account. Keep in mind that these codes usually have an expiration date and a usage limit, and they may stop working soon after they're shared, so don't count on them as a reliable long-term way to save money.

Is that keyword fixed and unchangeable?

I'm skeptical. Information from these kinds of channels often lacks an official source, and it may become invalid or the rules may change in a few days. It would be best to have someone follow up and confirm whether it still works now.