ʕ•ᴥ•ʔ One look at the RedotPay transactions page tells you whose fault the decline is
— card side: $25 and four switches · OpenAI side: their own admitted trial bug, one email
You get the trial with the card you already hold. Ten seconds in the app shows the reason, one fix per reason, and the same four switches unlock every other site that says no to this card.
RedotPay app → Transactions → the declined charge
│
├─ "insufficient funds" → top up $25, the auth holds $1–2
├─ "do not honor" → 3-D Secure off, then retry once
├─ "card not supported" → prepaid BIN refused, see below
└─ "incorrect details" → name and ZIP exactly as the KYC
The four switches
- 3-D Secure / OTP — turn it on in RedotPay. OpenAI’s processor wants the challenge, and a card that cannot answer gets a silent no
- International payments — on, obviously
- Online / e-commerce — on, separate switch on most crypto cards
- Card frozen — the one everybody forgets after a failed attempt
The card-side answer, in this board’s language
A US-BIN card, a US IP, and a billing ZIP that matches the card’s address. Those three agree and the charge passes.
First time using a BIN? → 
Working BIN Masterclass
The OpenAI-side answer
The “1 month free” was never on their checkout page. In September it lived in partner apps:
Revolut’s OpenAI bundle — 3 months of ChatGPT Go free on Standard, up to 12 on higher plans, claimed inside Revolut
App-store billing — OpenAI’s own page: a subscription bought in the iOS or Android app is charged by Apple or Google, in local currency, and app-store billing accepts card families the web checkout refuses
A bank debit card on the web, VPN off, country matching
Two sides, one fix each. Start with the transaction line. 
!