---
agentTools:
  projectIndex: https://docs.ninepay.com.br/llms.txt
  projectSearch: https://docs.ninepay.com.br/agentSearch?query=term1%20term2
---

# Start here

The path to your first NinePay API integration, from sandbox access to your first charge

These pages cover what you need before creating your first charge: how the API works, how to authenticate, where to test and how to import the API into your HTTP client.

<Cards columns={2}>
  <Card title="Introduction" icon="👋" href="/docs/introduction">Guides and reference: what you will find in each.</Card>
  <Card title="API Introduction" icon="🧭" href="/docs/api-introduction">Environments, headers, responses, errors, dates and card hashes.</Card>
  <Card title="Authentication" icon="🔑" href="/docs/authentication">API keys, environment prefixes, rotation and lifecycle.</Card>
  <Card title="Test Environment" icon="🧪" href="/docs/sandbox-en">The sandbox API and dashboard.</Card>
  <Card title="Test Cards" icon="💳" href="/docs/test-cards-en">Ending in 0 approves; ending in 1 to 9 declines.</Card>
  <Card title="Lists and Pagination" icon="📄" href="/docs/pagination">Pagination, sorting and filters for list endpoints.</Card>
</Cards>

To try the endpoints without writing code, download the API for Postman or Insomnia in [Collections](/docs/collections-en).