Agent PHP SDK

Use the approved 6MM Agent PHP package from backend services for user binding, transfers, entry URLs, and webhook verification.

Runtime

Item	Value
Package	sixmm/agent-sdk
Minimum PHP version	PHP 7.4+
Recommended PHP version	PHP 8.1+ or currently supported versions
Required extensions	ext-json, ext-curl

The PHP SDK package source and approved version are provided during partner onboarding. Do not assume that the package is available from public Packagist; configure the Composer repository supplied for your organization.

Supported scenarios

Scenario	SDK method
Bind user	bind
Fixed amount transfer	transfer
Transfer all out	transferAllOut
Reverse transfer	reverse
Query order	queryOrder
Create entry URL	createEntryUrl
Webhook verification	WebhookVerifier::verify

Backend integration rules

Load apiSecret from a secret manager or protected environment variable.
Keep user binding, transfer, signing, and webhook logic out of browser code.
Use decimal strings for asset amounts to avoid floating-point rounding.
Reuse the original agentOrderNo when querying an uncertain transfer result.
Verify webhook signatures against the raw request body before decoding or changing it.

Next steps

PHP Quick Start: configure Composer and initialize the client.
Agent SDK Overview: review the complete backend integration flow.
Secrets & Signing: protect credentials and understand HMAC signing.
Webhooks & Idempotency: process repeated callbacks safely.