Raj Nair

20, backend,infra & ai

[abhinav @AbhinavXJ]

@Subscriptions @Support

this account @RajNair06 purchased X subscription
the money got deducted, it says premium active
but he is not able to access any feature

and there is no way to contact support
we tried our best but no resolution

please fix this

[Raj Nair @RajNair06]

(3/3)
Under the hood: atomic spend caps (50 threads × $10 vs a $100 cap = exactly 10 approvals), fail-closed webhooks, an outbox worker with leases + backoff

Docs: https://t.co/nnviKZYENd
Repo: https://t.co/yCX7eIUoVU
in case you wanna play around : https://t.co/Ud0tv6S1gZ

[Raj Nair @RajNair06]

(1/3)
Finished building TollGate: a policy gateway between AI agents and PayPal.

Agents never touch money directly. They ask permission, and TollGate decides: allow, deny, hold for human approval, or dedupe. Everything lands in an append-only audit log.

Demo + repo below

[Raj Nair @RajNair06]

(2/3)
The full loop: a PayPal dispute webhook arrives, a LangGraph agent investigates over MCP, a human approves in the dashboard, and the refund executes on PayPal sandbox.

If the process dies mid-approval, it resumes from Postgres. Retries can’t double-refund.

[Raj Nair @RajNair06]

@navyabijoy what tool did you use for this demo ?

[Raj Nair @RajNair06]

@virbhadra05 Cfbr

[Raj Nair @RajNair06]

@chwapnil happy birthday , swapnil

[Raj Nair @RajNair06]

do check this one out folks !

[Raj Nair @RajNair06]

(1/3)

Day 5 of building TollGate, a gateway between AI agents and PayPal.

Now it runs end to end from the browser: a PayPal dispute webhook arrives, the agent investigates, a human approves or rejects in a dashboard, and the refund executes (or doesn’t).

[Raj Nair @RajNair06]

https://t.co/yCX7eIUoVU

[Raj Nair @RajNair06]

(1/3)

Day 5 of building TollGate, a gateway between AI agents and PayPal.

Now it runs end to end from the browser: a PayPal dispute webhook arrives, the agent investigates, a human approves or rejects in a dashboard, and the refund executes (or doesn’t).

[Raj Nair @RajNair06]

(3/3)
Approve in the dashboard and the paused agent resumes. Redelivery moves money exactly once, and a wrong approval ID never moves it.
Also: a kill switch and live policy edits for agents, audited as diffs. Dashboard shows the agent’s reasoning next to each request.
Repo 👇

[Raj Nair @RajNair06]

@sridharfyi interested . I'm Raj , a backend dev working across Go and Python stack . currently building a policy gateway between agents and PayPal .
https://t.co/yCX7eIUoVU
portfolio: https://t.co/LvJ7X71QAG

[Raj Nair @RajNair06]

@AbhinavXJ Happy Diwali , bhaii

[vir bhadra @virbhadra05]

need someone to help me redesign my website’s landing page

dm me if you are up to help me
https://t.co/9KrItiObiV

[Raj Nair @RajNair06]

@virbhadra05 cfbr

[Raj Nair @RajNair06]

@prathoshap @LatentForceHQ applied !

[Raj Nair @RajNair06]

Happy Diwali , chat 🎆🎇 . Have a prosperous one !

[Raj Nair @RajNair06]

my repo : https://t.co/yCX7eIUoVU

[Raj Nair @RajNair06]

Great read from Uber’s eng team. Perfect timing as I’m building my policy gateway between AI agents and PayPal. Semantic policy is boring but essential for secure AI apps. Mine has least privilege, PAP/PDP/PEP split, human approvals, audit logs. Really interested in whats next

[Uber Engineering @UberEng]

https://t.co/XFWteI3jUO