https://secure.interactsms.com/api/v1 and use basic credential authentication (username and password passed directly in the request body).
Available legacy APIs
JSON API (v1)
Send SMS via a JSON request body. Credentials passed as
User and Password fields.URL-Encoded API (v1)
Send SMS via
application/x-www-form-urlencoded. Compatible with query-string integrations.Key differences vs v2
| Feature | v1 (Legacy) | v2 (Current) |
|---|---|---|
| Auth | Credentials in body | OAuth 2.0 JWT |
| Bulk send | Single recipient | Multiple recipients |
| Scheduling | Unix timestamp | ISO 8601 datetime |
| Campaign tracking | NotifyId only | campaignName + notifyId |
| Response format | Plain text / status string | Structured JSON |