How to choose signer authentication for Salesforce e-signatures

The problem in two lines

When a contract goes out for signature you need to know who signed it, and you need the signed PDF filed back on the right Salesforce record. Getting that wrong means rework, delays and legal hassle. If you’re picking authentication for Salesforce e-signature authentication and signer identity verification Salesforce, the choices you make affect usability, security and auditability.

Salesforce e-signature authentication: pick from three practical options

There are three approaches that cover almost every deal you’ll face. Two of them are supported directly by Savvy DocGen: emailed one-time codes (OTP) and a per-signer password read from the signer’s Salesforce record. The third is an external, higher-assurance identity check you run outside the signer flow. Pick one based on risk and how fast you need signature turnaround.

Emailed one-time code (OTP)

How it works: the signer gets an email with a one-time numeric code. They paste the code into the signing page to prove they control that email address.

Best for: most customer-facing contracts where email is the normal business channel—renewals, quotes, SOWs.
Pros: low friction, familiar to signers, available immediately and supported by DocGen/Circularo.
Cons: email accounts can be compromised; deliverability failures happen when the Contact email is stale or blocked by spam filters.

Practical checklist for OTP:

Validate the Contact or Lead email before sending. Add a quick verification step on Opportunity or Contract if the email looks malformed.
Include a clear subject and cover text in the template so the signer recognises the message and doesn’t mark it spam.
Use OTP for routine renewals—if you send 200 renewals a month with a 60-page MSA, OTP minimizes friction and typically reduces hunt time for signatures compared with manual chasing.

Per-signer password read from the signer’s Salesforce record

How it works: DocGen reads a password field from the signer’s Contact, Lead or custom signer record and requires that password in addition to or instead of OTP.

Best for: high-value deals, reseller or partner signers, or internal signers where you can issue and manage passwords.
Pros: stronger control because the secret is pre-arranged and tied to a Salesforce record you control.
Cons: password distribution and management become your responsibility. If stored improperly, the field itself becomes a risk.

Practical checklist for per-signer passwords:

Create a dedicated field on Contact/Lead (or a signer__c object) to hold the password. Restrict access with field-level security and a permission set so only a small team can view or edit it.
If your org supports encrypted fields, use them for that password field.
Decide password policy up-front: length, rotation, and whether it’s single-use. Document the process so Legal and IT know how you issue and revoke passwords.

Signer identity verification Salesforce: when to combine OTP and password

Combining an emailed code and a per-signer password is overkill for low-value renewals but appropriate for high-value or regulated contracts. For example, a 60-page master services agreement signed by a new customer procurement team should get stronger checks than a routine monthly SaaS renewal for an existing account contact.

Use OTP alone when the primary risk is the signature being delayed or the email being wrong.
Use password alone when the signer is known and you can securely provision a secret (internal approvals, partners).
Combine OTP + password for high-value, high-risk, or one-off contracts where both email control and a pre-shared secret are warranted.

Operational pitfalls and how to avoid them

Small mistakes break workflows. Here are the practical traps I see and how to avoid them.

Stale Contact email: build a validation step on the Opportunity or Contract page layout (a quick button or Flow) so your rep confirms the signer and email before the send.
Badly stored passwords: don’t keep signer passwords in a profile field that every rep can view. Limit visibility and log access changes.
Resend confusion: track resend events on the record so Legal can see how many times a document was reissued before signature. Savvy DocGen files the finished document back to the same record, so the final signed PDF and its audit trail stay attached to the right Opportunity, Contract or custom object.
Repagination and signature boxes: use anchor tags for signature positions. Anchor tags survive repagination if you edit template content or swap document versions, so signatures don’t end up in the wrong place.

Example setup you can implement this week

Hypothetical setup for a mid-market company with frequent renewals and occasional high-value deals:

Create two templates: Renewal (OTP) and High-Value Agreement (OTP + per-signer password). Fill both from Opportunity and Account data.
Add a checkbox on Opportunity: Use_High_Auth__c. A Flow or button launches DocGen and selects the correct template and authentication method.
Store per-signer passwords in Contact.Password__c with field-level security and a restricted permission set.
File signed PDFs to the Opportunity Files. If the document exceeds 25 MB, use Files rather than Notes & Attachments.

Bring it together with Savvy DocGen

Savvy DocGen fills templates from records, supports emailed one-time codes and per-signer passwords read from signer records, sends for signature through your Circularo account, and writes the signed PDF back to the same record. Signature positions use anchor tags so they survive repagination, and you can bundle templates into one signature run when you need multiple documents signed together.

Try Savvy DocGen in your sandbox to test OTP, per-signer passwords, and a combined flow against a few real Opportunities and Contracts. That will show you where you need validation, which emails are stale, and whether passwords should be single-use or rotating for your org.