Document supported AgentCard processors

[hiroTamada]

summary

• document all nine AgentCard processor adapters
• distinguish ordinary approval holds from prepared single-use checkout
• list the recognized request formats for each processor

testing

• docs-only change; ran git diff --check

---

Note

Low Risk
Documentation-only update to Agentcard integration guidance; no runtime or API behavior changes in this diff.

Overview
Expands the Agentcard checkout coverage table from five to nine processors and adds a flow column that labels each adapter as either an ordinary approval hold or prepared single-use checkout (with Square marked as prepared while that mode is enabled in the current deployment).

New rows document Braintree, Worldpay, Bambora, and Mercado Pago with their recognized HTTPS POST endpoints; existing rows (Stripe, Shopify, Recurly, Razorpay) now spell out flow type and Razorpay’s merchant status reconciliation note.

Replaces the short alias-matching paragraph with guidance on when requests must match adapter layout for ordinary holds versus when cards must complete prepare_checkout first, which processors are prepared-only, and that Square on the current KERNEL deployment rejects unprepared checkouts instead of falling back to an ordinary hold.

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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[cursor]

Dense processor notes need bullets

Low Severity

The new processor-coverage paragraph packs several separate facts into one dense block: ordinary-hold matching rules, the prepare_checkout requirement, which adapters lack a hold path, current Square rejection behavior, leftover hold compatibility, and unrecognized-endpoint passthrough.

 

^{Triggered by learned rule: Use bullet lists when covering multiple distinct points in guides}

^{Reviewed by Cursor Bugbot for commit 76c8723. Configure here.}