> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slickerhq.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Integrating a custom billing system with Slicker

Slicker provides a flexible API-based integration for custom in-house billing systems, allowing businesses with proprietary or unique billing solutions to benefit from our advanced retry optimization and revenue recovery capabilities.

## How Custom Billing Integration Works

With a custom billing integration, Slicker acts as a decision engine for your billing system, determining the optimal timing and strategy for payment retries. This data-driven approach significantly improves recovery rates compared to static retry schedules.

```mermaid theme={null}
flowchart LR
    A[Your Billing System] -->|Event Data| B[Slicker Platform]
    C[Payment Processors] -->|Enriched Data| B
    B -->|Analytics & Machine Learning| D[Retry Decisions]
    D -->|Webhook to Your System| E[Optimized Retries]
    B <-.->|API Queries| A
```

### Integration Flow

1. **Data Ingestion**: Your system sends subscription, invoice, and transaction event data to Slicker's API endpoints.
2. **Payment Data Enrichment**: Optionally connect your [payment processors](/integrations/overview#payment-providers) directly to Slicker for enhanced data quality.
3. **Intelligent Analysis**: Slicker analyzes payment failures, customer behavior, and numerous other factors.
4. **Optimized Retry Execution**: When Slicker determines a retry should occur:
   * Slicker sends a webhook notification to your endpoint with retry instructions
   * Alternatively, your system can query Slicker's API to check when retries should be performed

## Integration Requirements

### Your Responsibilities

1. **Event Transmission**: Implement API calls to send subscription, invoice, and transaction events to Slicker
2. **Data Mapping**: Map your system's data fields to Slicker's expected format
3. **Webhook Endpoint**: Create an endpoint to receive retry instructions from Slicker
4. **Retry Execution**: Hook up the Slicker retry decision with your existing logic to execute retries. At this step you can perform further checks based on your business requirements if a retry should be executed.

### Data Requirements

While most fields are optional, the quality of Slicker's recovery strategies improves with the richness of data provided:

```mermaid theme={null}
flowchart TD
    A[Required Data] -->|Minimum| B[Basic Recovery]
    C[Additional Data] -->|Enhanced| D[Improved Recovery]
    E[Full Data + Payment Processor] -->|Optimal| F[Maximum Recovery]
```

* **Essential Events**: Subscription creations/changes, invoice generation, payment attempts
* **Valuable Context**: Customer history, subscription details, failure reasons
* **Complete Details**: See the [API Reference](/integrations/billing/custom/api/overview) for comprehensive field specifications

## Setup Process

Setting up a custom billing integration typically follows these steps:

<Steps>
  <Step title="Initial Consultation">
    Meet with Slicker's integration team to discuss your specific needs and system architecture.
  </Step>

  <Step title="API Implementation">
    Develop the necessary API calls to send event data to Slicker and receive retry instructions.
  </Step>

  <Step title="Testing and Validation">
    Verify data accuracy and webhook functionality in a test environment.
  </Step>

  <Step title="Progressive Rollout">
    Start with a subset of accounts to validate performance before full deployment.
  </Step>
</Steps>

## Historical Data Sync

While Slicker can start working with new incoming data immediately, syncing historical data significantly improves the effectiveness of our recovery strategies from day one:

```mermaid theme={null}
flowchart LR
    A[Historical Data] -->|Machine Learning| B[Improved Initial Accuracy]
    B -->|Better Recovery| C[Faster ROI]
```

### Benefits of Historical Data

* **Faster Learning**: Slicker's algorithms can immediately analyze past payment patterns and failures
* **Better Initial Results**: Recovery strategies are optimized from the start rather than requiring a learning period
* **Complete Customer Context**: Full payment history provides crucial context for decision-making

### Sync Options

* **Standard API**: The same APIs used for ongoing data can be used to sync historical events
* **Bulk Import**: For large data volumes, our integration team can work with you on custom bulk import solutions
* **Selective History**: Even partial history (e.g., last 3-6 months) provides significant benefits

<Info>
  The Slicker integration team will help determine the optimal amount of historical data to sync based on your business model and data volume.
</Info>

## Engineering Support

We understand that implementing a custom integration requires engineering resources. Slicker provides:

* Dedicated integration specialists to guide your team
* Documentation and code samples to accelerate development
* Technical consultation throughout the implementation process
* Ongoing support post-implementation

<Info>
  For optimal results, we highly recommend also integrating your payment processors directly with Slicker. This provides essential payment error details that significantly improve recovery rates. See our [payment provider integrations](/integrations/overview#payment-providers) for more information.
</Info>

## Next Steps

To begin your custom billing integration:

1. Review our [API Reference](/integrations/billing/custom/api/overview) to understand data requirements
2. [Contact our team](https://www.slickerhq.com/contact) to schedule an integration consultation
3. Explore connecting your [payment processors](/integrations/overview#payment-providers) for enhanced results