Quick save before you spend a peso on a “Mexican vCC”: you’re pushing a bricked door. Two things the dig turned up —
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A non-resident cannot legitimately get an MX-BIN card (every Mexican issuer needs a CURP + Mexican phone + address), and
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you probably don’t need one — your decline is a billing-country mismatch, not “wrong nationality.” Stripe reads your card’s issuing country from its BIN and wants the billing-country field to match that; a Mexico VPN on a foreign card makes the mismatch worse.
Also: the “1-month free” isn’t an OpenAI trial — it’s a Rappi / BBVA partner code. So here are the doors that actually open, cleanest first 
The clean wins (no card check, no ToS risk)
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Revolut’s global ChatGPT Go bundle — open a free Revolut Standard account and claim 3 months of ChatGPT Go inside the Revolut app. No VPN, no Mexican anything, OpenAI never runs a card check. (Global except US/Brazil; free tier still rolling out per-country.) — the actual answer.
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App-store purchase = no card decline possible. ChatGPT Go is a ~$8 in-app buy where Apple/Google is the merchant — Stripe/BIN never fires. Set the store region to Mexico → fund it with a Mexico Apple/Google gift-card balance (any reputable reseller, paid with your card) → subscribe in the iOS / Android app. (Android locks country-change to once/year — prefer iOS.)
Want to keep using your own card? Fix the real decline
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On the Stripe form set billing country = your card’s TRUE country (not Mexico), address exactly as your bank has it → OpenAI billing settings. The Mexico IP only surfaces the offer — it never rescues a mismatched card.
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At your bank, switch ON “international / online purchases” + confirm 3-D Secure, and use a credit card (not bare prepaid) → why a Mexican card itself declines.
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Never-overcharged safety: mint a merchant-locked, $1-capped card that you freeze after it verifies → Privacy.com (US) or Wise (global, freeze-after-verify). (Their BIN is your home country — they cap the charge, they don’t make you “look Mexican.”)
🇲🇽 The actual "1-month free" (and why it's Mexico-only)
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Rappi “Beneficios Pro” — 1 free month (6 for Pro Black) via a code in the Rappi app → paste on ChatGPT. Needs a Rappi-MX account + a ChatGPT you’ve never paid on.
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BBVA México — 3 months free (till 23 Aug 2026) — but it requires a BBVA card on file + auto-renews at 110 MXN, and a BBVA account needs Mexican residency + CURP. Both are customer-gated: real Mexican-side status, not a card you can buy.
⚠️ Dead ends — don't burn time (or get scammed)
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OXXO / SPEI can’t do it — Stripe supports them only as one-time rails; recurring subs aren’t supported and OpenAI never enabled them at checkout.
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Anyone selling a “ready/loaded Mexican vCC” to a foreigner is selling a mislabeled foreign-BIN card or a KYC-faked account — that’s the stolen/carded lane. Hard skip.
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The one legit MX-side card, ARQ/DolarApp, still needs a CURP (the residency wall) — great if you can lawfully get one, closed if not. Don’t fake it.
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To merely surface the MX offer you need a Mexico IP (PrivadoVPN free has a rare MX server; a residential proxy is the one that won’t get flagged) — but VPN-for-pricing-you’re-not-entitled-to breaks OpenAI’s ToS, which is exactly why the free Revolut route up top is the smart play.
If it’s your account that’s flagged (declined again and again), start clean with a custom-domain catch-all inbox — temp-mail is blocklisted, this never is.
Stop hunting a Mexican card — grab the 3 free months Revolut is handing out, or let the App Store be the “card.” Same ChatGPT Go, zero decline.