API & SDK
Comprehensive REST APIs and SDKs that support document generation, signing sessions, webhooks, and programmatic user management for embedding signature workflows into customer-facing products.
Technology organizations must balance compliance, developer integration, and secure document workflows; choosing between a signature-first provider and a CRM-centric vendor impacts implementation effort and long-term maintenance.
Sales operations managers coordinate quoting, approvals, and CRM records; they need predictable signature workflows, template management, and an audit trail to resolve disputes and speed time-to-revenue while minimizing manual handoffs.
Platform engineers are responsible for API integration, authentication, and automation; they require robust developer documentation, SDKs, webhooks, and clear security controls to embed signing into CI/CD and customer portals.
Selecting a solution should reflect the balance between security, integration flexibility, and the operational model used by these teams.
Comprehensive REST APIs and SDKs that support document generation, signing sessions, webhooks, and programmatic user management for embedding signature workflows into customer-facing products.
Single sign-on options including SAML and OAuth for enterprise identity integration and centralized access control across CRM and signing portals.
Reusable templates with merge fields and conditional logic to minimize manual edits and ensure consistent contract structure across teams.
Ability to send one document to many recipients with individualized fields and tracking to support large-scale renewals or onboarding.
Immutable event logs capturing signer IP, timestamps, and authentication steps to support compliance and dispute resolution.
Multi-factor and certificate-based signer verification options for high-assurance transactions and regulated agreements.
Direct integration with Google Drive and Docs allows users to send and sign documents from within native Google interfaces and sync signed copies back to Drive for centralized storage and access control.
Prebuilt connectors for common CRMs let teams map fields, attach signed agreements to records, and trigger sends from opportunity or account workflows without custom middleware.
Support for Dropbox, Box, and AWS S3 provides flexibility for storing signed documents alongside other technical artifacts and maintaining backup policies consistent with IT processes.
Webhook and API support enable event-driven architectures that notify CI systems, billing platforms, or license provisioning services once a signature completes.
| Setting Name | Configuration |
|---|---|
| Reminder Frequency | 48 hours |
| Signer Authentication | Email OTP |
| Template Approval | Admin sign-off |
| Webhook Retry Policy | 3 attempts |
| Document Retention | 7 years |
Confirm supported versions and SDK compatibility with internal development stacks before selecting a vendor to reduce integration overhead and ensure long-term maintainability.
A mid-market SaaS vendor automated quotes and NDAs with an integrated signature flow that tied to opportunity records
Resulting in faster close rates and fewer admin errors, improving sales throughput and forecasting accuracy.
A platform company embedded an eSignature flow into its developer onboarding portal to capture license and API terms
Leading to streamlined developer access provisioning and an auditable record tied to customer accounts.
| Criteria | signNow (Recommended) | iSales | Notes |
|---|---|---|---|
| eSignature Core | Comparable core signing | ||
| Audit Trail Detail | Detailed | Detailed | Similar evidence levels |
| Developer API | Comprehensive | Limited | signNow offers broader API surface |
| SSO & SAML | Enterprise-focused options |
| Plan | signNow (Recommended) | signNow Business | signNow Enterprise | iSales Professional | iSales Enterprise |
|---|---|---|---|---|---|
| Typical monthly pricing | Per-user tiers available | Mid-range per user | Custom enterprise pricing | Subscription per user | Custom enterprise pricing |
| User seats | Single and multi-seat plans | Up to 50 seats typical | Unlimited seats with agreement | Small-to-mid companies | Large enterprise focus |
| API access | Available on paid plans | Included in business+ | Included enterprise-grade | Limited or add-on | Enterprise API included |
| SSO and SAML | Available enterprise | Available add-on | Standard enterprise | Varies by plan | Included enterprise |
| Support level | Email and enterprise support | Business hours support | Priority enterprise support | Standard support | Dedicated enterprise success |