Deprecation Notice - OAuth 1.0 Migration

FOR ENGINEERING TEAM

Subject: OAuth 1.0 Endpoint Deprecation - June 30, 2026 Migration Deadline

Engineering,

OAuth 1.0 endpoint deprecating June 30, 2026. Action required: migrate to OAuth 2.0.

Timeline:

• Now through June 30, 2026: OAuth 1.0 remains fully operational
• June 30, 2026: OAuth 1.0 endpoint permanently disabled
• Recommended migration: Complete by Q2 2026 (3 months buffer)

Technical Migration:

• OAuth 2.0 endpoint: /oauth/v2/authorize (live now)
• OAuth 1.0 endpoint: /oauth/v1/authorize (deprecated)
• Full backward compatibility: Both endpoints operational during transition
• Zero security gap: OAuth 2.0 uses industry-standard bearer tokens, PKCE flow
• Breaking changes: Token format (JWT vs legacy), refresh token mechanism

What to Update:

1. Authentication flow: Replace OAuth 1.0 signing with OAuth 2.0 bearer tokens
2. Token storage: Update to handle JWT format
3. Refresh logic: Implement OAuth 2.0 refresh token flow
4. Error handling: New error codes for OAuth 2.0 spec compliance

Migration Resources:

• Technical migration guide: [docs/oauth2-migration.md]
• Code examples (Python, Node, Go): [github.com/oauth2-examples]
• Testing sandbox: [staging-oauth2.api.example.com]
• Migration verification script: [tools/verify-oauth2-migration.sh]

Testing:

• Staging environment supports both OAuth versions
• Run migration verification script before production
• Monitor: authentication success rates, token refresh errors
• Rollback: Fallback to OAuth 1.0 available until June 30, 2026

Support: Questions? #engineering-auth or oauth-migration@example.com

[Your name]

FOR SALES TEAM

Subject: HEADS-UP: OAuth 1.0 Deprecation June 2026 (Customer Communication)

Sales team,

Technical update affecting customers using API integrations: OAuth 1.0 deprecating June 30, 2026.

What Customers Need to Know:

• Old authentication method (OAuth 1.0) being replaced with newer, more secure version (OAuth 2.0)
• Deadline: June 30, 2026 (18 months from now)
• Action required: Update API integration code
• Zero downtime: Both versions work during entire transition period

Customer Benefits:

• Better security: Industry-standard OAuth 2.0 (what Google, Microsoft use)
• Simpler implementation: Less complex than OAuth 1.0 signing
• Future-proof: OAuth 2.0 is long-term standard
• Full support window: 18 months to migrate with engineering support

Who’s Affected:

• Customers with custom API integrations using OAuth 1.0
• Third-party tools connecting via OAuth 1.0
• Most customers unaffected (use OAuth 2.0 already)

How to Position:
“We’re upgrading to OAuth 2.0—the same secure authentication Google and Microsoft use. You have until June 2026 to update your integration. Our team provides migration guides and support throughout.”

Objection Handling:

Q: “Why change what’s working?”
A: “OAuth 1.0 is legacy tech. OAuth 2.0 is more secure, simpler, and industry standard. We’re giving 18 months to migrate smoothly.”

Q: “How complex is migration?”
A: “Most migrations take 1-2 days of dev time. We provide code examples, testing sandbox, and engineering support.”

Q: “Cost us money?”
A: “No—this is a security upgrade. We provide all tools and support at no charge.”

Proactive Customer Communication:

• Engineering sending technical notice to affected customers next week
• Sales should mention during renewals: “FYI: migrate OAuth by June 2026—we’ll support you”

Escalation: Technical migration questions → Customer success or #sales-engineering

[Your name]

FOR CUSTOMER SUCCESS / SUPPORT

Subject: OAuth 1.0 Deprecation June 30, 2026 - Customer Support Guide

CS/Support,

June 30, 2026: OAuth 1.0 endpoint being deprecated. Customers using API integrations need to migrate to OAuth 2.0.

What’s Changing:

• Old API authentication method (OAuth 1.0) → New method (OAuth 2.0)
• Deadline: June 30, 2026
• Backward compatibility: Both work until deadline (zero downtime)
• After June 30, 2026: OAuth 1.0 stops working permanently

Who’s Affected:

• Customers with custom API integrations using OAuth 1.0
• Third-party tools connecting via legacy OAuth 1.0
• Check: Customer’s API logs or integration settings show OAuth version

Not Affected:

• Customers already using OAuth 2.0 (most modern integrations)
• Customers not using API (web/app only)

Customer Explanation:
“We’re upgrading API security to OAuth 2.0—the same standard Google and Microsoft use. If your integration uses OAuth 1.0, you’ll need to update it by June 30, 2026. Both versions work during the transition, so zero downtime. We provide migration guides and engineering support.”

FAQ:

Q: “How do I know if I’m using OAuth 1.0?”
A: “Check your integration settings at [dashboard URL] or contact our support. We can identify your OAuth version from your API calls.”

Q: “What happens if I don’t migrate?”
A: “After June 30, 2026, OAuth 1.0 authentication will fail. Your integration will stop working until you update to OAuth 2.0.”

Q: “How hard is migration?”
A: “Most customers complete migration in 1-2 days of development work. We provide step-by-step guides, code examples, and testing sandbox.”

Q: “Can you migrate for us?”
A: “We provide complete migration documentation and engineering support. If you need hands-on assistance, contact your account manager for professional services options.”

Q: “Any cost?”
A: “No charge—this is a security upgrade. All migration resources and support are included.”

Q: “Why can’t you keep OAuth 1.0?”
A: “OAuth 1.0 is legacy technology with security limitations. OAuth 2.0 is the industry standard for modern, secure authentication.”

Resources to Share:

• Migration guide: [help.example.com/oauth2-migration]
• Video tutorial: [youtube.com/oauth2-howto]
• Code examples: [github.com/oauth2-examples]
• Testing sandbox: [staging-oauth2.api.example.com]

Escalation:

• Technical migration help → #customer-engineering or oauth-support@example.com
• Business concerns (cost, timeline) → Account manager
• Critical deadline extension requests → VP Engineering (rare exception only)

Proactive Outreach:
Engineering team sending automated email to all customers using OAuth 1.0 next week. Expect follow-up questions.

[Your name]