API deadlines and removal dates: Stripe, Shopify, Twilio, OpenAI (from changes published Sep 5 - Oct 5, 2026)
8 entries on the public changelogs of Stripe, Shopify, Twilio and OpenAI, published 2026-09-05 to 2026-10-05, state a calendar date in their text: a shutdown, a discontinued event type, a behavior switch or a date to update by. They are listed below, earliest date first. By vendor: Stripe: 0, Shopify: 1, Twilio: 4, OpenAI: 3.
Independent publication, not affiliated with or endorsed by Stripe, Shopify, Twilio, OpenAI or any other vendor named.
AI-generated summaries of public changelogs, with source links.
Informational only. Verify against the official changelog before making changes. No guarantee of completeness.
Rows in the table: 8. An entry is listed only when its summary or its action text states a full calendar date (month, day and year). An entry with no stated date is not listed, and no date was inferred: the other 134 of the 142 entries of this issue are not on this page. 3 of the 8 dates had already passed when the changelogs were read on 2026-10-05: September 22, September 30 and October 1, 2026.
The Deadline column quotes the date as the entry states it. For the Twilio Heightened Awareness Period it is the first day of the period. Stripe has no row: none of its 68 entries states a calendar date in its summary or action text, and most of its breaking changes are tied to adopting API version 2026-09-30.endive. They are on the breaking changes page.
See also: deprecations across the four vendors, method and coverage and the index of this issue.
Read on 2026-10-05: https://docs.stripe.com/changelog; https://shopify.dev/changelog; https://www.twilio.com/en-us/changelog and https://www.twilio.com/en-us/changelog.feed.xml; https://developers.openai.com/api/docs/changelog and https://developers.openai.com/api/docs/deprecations. The Source column prints each entry's address as text.
| Deadline | Vendor | Type | Change | What to do | Source |
|---|---|---|---|---|---|
| September 22, 2026 | Twilio | deprecation | Verify Events: Verification Attempt DLR event type will be discontinued The Verification Attempt DLR event type in Verify Events is discontinued after September 22, 2026. | Check any Verify Events consumers that depend on this event type. | https://www.twilio.com/en-us/changelog/verify-events-verification-attempt-DLR-discontinued |
| September 30, 2026 | Twilio | breaking | Conference list endpoint will default to in-progress conferences only on September 30, 2026 From September 30, 2026 the Conference list endpoint returns only in-progress conferences unless a status filter is given. | Add Status=completed to list requests that need completed conferences. | https://www.twilio.com/en-us/changelog/conference-list-endpoint-july-2026 |
| October 1, 2026 | OpenAI | deprecation | GPT-5.4-Cyber OpenAI announced that gpt-5.4-cyber shuts down on October 1, 2026, pointing users to the most capable cyber model available to them. | Confirm nothing still calls gpt-5.4-cyber. | https://developers.openai.com/api/docs/deprecations#2026-09-11-gpt-54-cyber |
| October 22, 2026 | Twilio | change | Introducing Provider Failover and "Auto" mode Provider selection for Real-Time Transcriptions on October 22, 2026 On October 22, 2026 Real-Time Transcriptions gain provider failover at session start, kept within region with a per-subaccount opt-out, and an auto value for the transcription engine. | Review whether failover to another provider is acceptable and opt out per subaccount if not. | https://www.twilio.com/en-us/changelog/real-time-transcriptions-october-2026 |
| November 19, 2026 | Twilio | change | Twilio Heightened Awareness Period (HAP) – November 19, 2026 - January 4, 2027 During the heightened awareness period from November 19, 2026 to January 4, 2027, Twilio monitors and may limit message rates to US destinations and may move high-volume accounts to Market Throughput. | Review US messaging volume plans and throughput settings before the period starts. | https://www.twilio.com/en-us/changelog/hap-nov192026-jan42026 |
| January 6, 2027 | OpenAI | deprecation | Text-to-speech models tts-1, tts-1-hd and two dated gpt-4o-mini-tts snapshots are deprecated with a shutdown date of January 6, 2027; the listed replacement is gpt-realtime-2.1-mini. | Inventory text-to-speech calls using these models and schedule migration. (Source note: the link opens the deprecations page; the section is headed '2026-10-01: Text-to-speech models'.) | https://developers.openai.com/api/docs/deprecations |
| April 1, 2027 | OpenAI | deprecation | GPT-5.3-Codex, GPT-5.1, GPT-5.4-Nano gpt-5.3-codex, gpt-5.1 and gpt-5.4-nano are deprecated with a shutdown date of April 1, 2027; the listed replacements are gpt-6-sol for the first two and gpt-6-luna for gpt-5.4-nano. | Inventory usage of these three models and schedule migration to the listed replacements. (Source note: the link opens the deprecations page; the section is headed '2026-10-01: GPT-5.3-Codex, GPT-5.1, GPT-5.4-Nano'.) | https://developers.openai.com/api/docs/deprecations |
| May 1, 2027 | Shopify | new | Polaris 2.0 release candidate A Polaris 2.0 release candidate is available for embedded App Home, and the entry says Built for Shopify apps must update by May 1, 2027. | Test your embedded app against the release candidate in both admin designs. | https://shopify.dev/changelog/posts/polaris-2-0-release-candidate |
What the paid brief adds
This page is the free list. The paid issue covers all 142 entries and adds:
- the action checklist: what to do for each entry, or a plain "none" when the change needs nothing from you;
- an "Act first" section: the 46 breaking changes and deprecations and nothing else, grouped by vendor, each with what to do;
- a source link for every entry;
- a CSV file with all entries, one row each, to filter or import.
Issue 1, a one-time $7 download: an HTML brief plus a CSV. A short README text file comes with them. The issue covers 2026-09-05 to 2026-10-05. You pay once for this one dated issue: nothing is billed again, and no later issue or update is included. The price and terms are shown on the Gumroad page before you pay.