Guide
How to Send a Vendor Portal Link
By Keelstar Team · Updated July 11, 2026
The short answer
Send the portal link from a monitored system address or workflow notification — not a personal buyer inbox that goes dark when someone is on PTO. The message should name your company, the vendor's legal entity, what they must complete, the deadline, and a support contact. Use a unique link tied to the vendor record so submissions attach automatically. Never ask vendors to email W-9s or bank letters as attachments when your policy requires portal upload. Log send time, open events, and completion status so AP can see blockers without chasing buyers for updates.
What the invitation email must include
Vendors ignore vague requests. Include legal name, relationship context (new supplier, post-merger refresh), document list, deadline, and consequence for missing it — typically payment or PO hold.
Use tracked sends, not one-off forwards
Buyers forwarding portal links from personal mailboxes lose visibility when they change roles. System-generated invitations create an audit trail and enable automated reminders without manual copy-paste.
Security expectations for vendors
State that tax and banking data must be submitted through the portal, not email replies. This protects the vendor and satisfies most infosec policies. Link to a brief FAQ if vendors push back.
Reminder cadence
Automate reminders at seven and fourteen days for incomplete packets. Escalate to the buyer or vendor manager at twenty-one days. Manual reminder discipline does not scale past a few dozen active onboardings.
Confirm completion on your side
Portal submission is not the same as approval. Define who validates W-9 TIN, COI limits, and banking before status moves to ready-for-payment. Vendors should receive confirmation when they are fully cleared.
Frequently asked questions
- Should the portal link go in the first vendor email?
- Yes — send it with the initial onboarding notice after internal approval to engage the vendor. Delaying the link creates duplicate data collection over email.
- What if the vendor says the link expired?
- Regenerate from the vendor record, resend with a new deadline, and log the resend. Expired links often mean the original request sat unread — follow up by phone for high-spend vendors.
- Can multiple contacts at the vendor use one link?
- Prefer one link per vendor entity tied to your master record. If the vendor needs multiple contributors, use a portal that supports delegated tasks rather than forwarding a single-use link externally.
- How do we prevent phishing concerns?
- Use a consistent sender domain, explain the request in plain language, and provide a verified phone number for the vendor to confirm legitimacy before entering tax or banking data.
Related guides
Put this into a monitored workflow
Vendor Packet handles this continuously — with reminders and an audit trail.