Vendor onboarding workflow with email allowlist and NetSuite integration
Build a vendor (supplier) onboarding workflow for a finance/FinOps team. The goal is to replace a manual, inbox-and-spreadsheet onboarding process with a controlled, auditable, self-service pipeline that runs from a vendor's first submission all the way to a created vendor record in the finance system, with a human approval step in the middle. Persist state in a shared database so the steps can hand off to each other. Gate who can onboard with an email allowlist. Support two ways to populate it: a machine endpoint (an HTTP API route, secured with an unguessable id) so an upstream system — I used Tropic feeding in via a Tines story, but frame it as any procurement or contract tool — can add approved emails automatically; and an internal admin page (an authenticated HTTP route, restricted to the space) where staff can add or remove allowlist entries by hand. Trigger the vendor experience from a public HTTP route that the app itself gates: the vendor enters their email, and if it's on the allowlist you email them a one-time code, verify it, then show the onboarding form where they enter company and bank details and upload a document. Make each allowlist entry single-use. On submission, generate a formatted PDF for the vendor, then fan out to notify the team: email the finance team the uploaded document plus the PDF, and post an alert to your team chat with a link to the review console. Provide an internal approval console (an authenticated HTTP route) where reviewers see pending submissions and either approve — capturing the config needed to create the record downstream — or reject with a reason. On approval, create the vendor in your finance/ERP system via its API; on rejection, email the vendor the reason and invite them to resubmit. For the specific services, use these but treat each as a swappable choice: send emails via Gmail — or your team's email provider; post alerts to Slack — or your team's chat tool; create the vendor record in NetSuite — or your ERP/finance system's API; and accept allowlist additions from Tropic via a Tines story — or whatever procurement/contract tool you use. Use connectors for all authentication; keep no credentials in code. Tools used: Gmail API, Slack API, NetSuite REST API, Tropic (via Tines story), SQLite
What this prompt builds
This workflow automates vendor onboarding from initial submission through NetSuite record creation, replacing manual inbox-and-spreadsheet processes with a gated, self-service pipeline. Vendors on an email allowlist submit company and bank details through a verification-protected form, then finance reviews and approves submissions via a console before the workflow automatically creates the vendor record in NetSuite. The system provides audit trails, prevents unauthorized submissions, and eliminates manual data entry errors.
The problem
Finance teams onboarding new vendors face a slow, error-prone process: chasing company and bank details over email, collecting documents in scattered inboxes, manually keying data into NetSuite, and lacking control over who can submit or when sensitive banking information gets reviewed. This workflow replaces that inbox-and-spreadsheet chaos with a secure, end-to-end pipeline. It gates submissions with an email allowlist (fed automatically from procurement tools or managed by hand), verifies vendors with a one-time code, lets them self-serve their details and documents, routes everything to a finance approval console, and on approval automatically creates the NetSuite vendor record—delivering a controlled, auditable funnel from submission to ERP with human review in the middle.
Solution and impact
The workflow eliminates manual data entry and gives finance teams full control over who can onboard and when information is reviewed. By gating submissions with a single-use email allowlist, verifying vendors with one-time codes, and packaging all details into a PDF and approval console, it removes scattered emails and spreadsheets from the process. On approval, the workflow automatically creates the vendor record in NetSuite via API, saving hours per vendor, reducing keying errors, and providing a complete audit trail from submission to ERP—turning vendor onboarding into a secure, self-service funnel that finance can trust.