feat: add 23 new CLI tools and integration guides

New tools across 13 categories:
- Email/Newsletter: beehiiv, klaviyo, postmark, brevo, activecampaign
- Data Enrichment: clearbit, apollo
- CRO/Testing: hotjar, optimizely
- Analytics: plausible
- Scheduling: calendly, savvycal
- Forms: typeform
- Messaging: intercom
- Social: buffer
- Video: wistia
- Payments: paddle
- Affiliate: partnerstack
- Reviews: trustpilot, g2
- Push: onesignal
- Webinar: demio, livestorm

Each tool includes a zero-dependency CLI and integration guide.
Registry and CLI README updated with all new entries.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/integrations/paddle.md

@@ -0,0 +1,212 @@
+# Paddle
+
+SaaS billing and payments platform with built-in tax compliance, acting as merchant of record for global sales.
+
+## Capabilities
+
+| Integration | Available | Notes |
+|-------------|-----------|-------|
+| API | ✓ | REST API for products, prices, subscriptions, transactions |
+| MCP | - | Not available |
+| CLI | ✓ | [paddle.js](../clis/paddle.js) |
+| SDK | ✓ | Node.js, Python, PHP, Go |
+
+## Authentication
+
+- **Type**: Bearer Token
+- **Header**: `Authorization: Bearer {api_key}`
+- **Get key**: Paddle dashboard > Developer Tools > Authentication
+- **Production URL**: `https://api.paddle.com`
+- **Sandbox URL**: `https://sandbox-api.paddle.com`
+- **Note**: Version specified via header, not path. Set `PADDLE_SANDBOX=true` env var for sandbox.
+
+## Common Agent Operations
+
+### List products
+
+```bash
+GET https://api.paddle.com/products
+```
+
+### Create a product
+
+```bash
+POST https://api.paddle.com/products
+
+{
+  "name": "Pro Plan",
+  "tax_category": "standard",
+  "description": "Professional tier subscription"
+}
+```
+
+### Create a price for a product
+
+```bash
+POST https://api.paddle.com/prices
+
+{
+  "product_id": "pro_01abc...",
+  "description": "Monthly Pro",
+  "unit_price": {
+    "amount": "2999",
+    "currency_code": "USD"
+  },
+  "billing_cycle": {
+    "interval": "month",
+    "frequency": 1
+  }
+}
+```
+
+### List customers
+
+```bash
+GET https://api.paddle.com/customers
+```
+
+### Create a customer
+
+```bash
+POST https://api.paddle.com/customers
+
+{
+  "email": "customer@example.com",
+  "name": "Jane Smith"
+}
+```
+
+### List subscriptions
+
+```bash
+GET https://api.paddle.com/subscriptions?status=active
+```
+
+### Get subscription details
+
+```bash
+GET https://api.paddle.com/subscriptions/{subscription_id}
+```
+
+### Cancel a subscription
+
+```bash
+POST https://api.paddle.com/subscriptions/{subscription_id}/cancel
+
+{
+  "effective_from": "next_billing_period"
+}
+```
+
+### Pause a subscription
+
+```bash
+POST https://api.paddle.com/subscriptions/{subscription_id}/pause
+```
+
+### List transactions
+
+```bash
+GET https://api.paddle.com/transactions
+```
+
+### Create a discount
+
+```bash
+POST https://api.paddle.com/discounts
+
+{
+  "amount": "20",
+  "type": "percentage",
+  "description": "20% off first month",
+  "code": "WELCOME20"
+}
+```
+
+### Create a refund adjustment
+
+```bash
+POST https://api.paddle.com/adjustments
+
+{
+  "transaction_id": "txn_01abc...",
+  "action": "refund",
+  "reason": "Customer requested refund",
+  "items": [{"item_id": "txnitm_01abc...", "type": "full"}]
+}
+```
+
+### List events
+
+```bash
+GET https://api.paddle.com/events
+```
+
+### List event types
+
+```bash
+GET https://api.paddle.com/event-types
+```
+
+## Key Metrics
+
+### Transaction Metrics
+- `totals.total` - Total amount charged
+- `totals.tax` - Tax amount
+- `totals.subtotal` - Amount before tax
+- `totals.discount` - Discount applied
+- `currency_code` - Transaction currency
+
+### Subscription Metrics
+- `status` - active, canceled, paused, past_due, trialing
+- `current_billing_period` - Current period start/end
+- `next_billed_at` - Next billing date
+- `scheduled_change` - Pending changes (cancellation, plan change)
+
+### Product/Price Metrics
+- `unit_price.amount` - Price in lowest denomination
+- `billing_cycle` - Interval and frequency
+- `trial_period` - Trial duration if set
+
+## Parameters
+
+### List Filtering
+- `status` - Filter by status (e.g., active, archived)
+- `after` - Cursor for pagination
+- `per_page` - Results per page (default: 50)
+- `order_by` - Sort field and direction
+
+### Subscription Cancel Options
+- `effective_from` - `immediately` or `next_billing_period`
+
+### Price Billing Cycle
+- `interval` - `day`, `week`, `month`, `year`
+- `frequency` - Number of intervals between billings
+
+### Tax Categories
+- `standard` - Standard tax rate
+- `digital-goods` - Digital goods tax rate
+- `saas` - SaaS-specific tax rate
+
+## When to Use
+
+- Managing SaaS subscription billing with tax compliance
+- Creating products and pricing tiers
+- Processing refunds and adjustments
+- Handling subscription lifecycle (create, pause, cancel, resume)
+- Global tax handling as merchant of record
+- Discount and coupon management for promotions
+
+## Rate Limits
+
+- 100 requests per minute
+- Applies across all endpoints
+- HTTP 429 returned when exceeded
+
+## Relevant Skills
+
+- pricing-page
+- saas-metrics
+- churn-reduction
+- launch-sequence
+- monetization-strategy