docs(TSP-1112): fix incorrect payment method management documentation

[claude]

Summary

• Added a new "Managing and updating payment methods" section to both billing tabs (new billing and old billing) in /admin/subscriptions/plans.mdx
• The section uses the correct path: bottom-left Manage plan / credits counter > Manage payment methods
• Notes that only Organization admins can manage payment methods
• Clarified that the "View details" button under Settings > Plan & Billing > Payment is for invoice access only, not for managing payment methods (this was the source of customer confusion in support issue 8982)

Fixes incorrect documentation that was directing users to Settings > Plan & Billing > Payment > "View details" to manage payment methods (that path is for invoices only).

Linear issue: https://linear.app/relevance/issue/TSP-1112/

Test plan

• Verify both billing tabs show the new "Managing and updating payment methods" section after "Paying for plans" and before "Cancelling your subscription"
• Verify the old billing invoices step 3 includes the clarifying note about "View details" being for invoices only
• Check all headings are in sentence case
• Confirm no broken internal links

🤖 Generated with Claude Code

[linear]

TSP-1112 Fix incorrect payment method change instructions in docs

[mintlify]

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Project	Status	Preview	Updated (UTC)
relevanceai	🟢 Ready	View Preview	Mar 27, 2026, 12:20 AM