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

# Quick start

> Get up and running with the Acquiring API in minutes.

<Steps>
  <Step title="Get your credentials">
    Your client ID and client secret are provided by Tesouro during onboarding. To request access, have your designated team lead submit an [access request](https://d92rm.share.hsforms.com/2rxMT-N-nQ-atFj2t5ODm2w).
  </Step>

  <Step title="Get an access token">
    Exchange your credentials for a short-lived JWT:

    ```bash lines theme={null}
    curl --location 'https://api.sandbox.tesouro.com/openid/connect/token' \
      --header 'Content-Type: application/x-www-form-urlencoded' \
      --data-urlencode 'grant_type=client_credentials' \
      --data-urlencode 'client_id=YOUR_CLIENT_ID' \
      --data-urlencode 'client_secret=YOUR_CLIENT_SECRET'
    ```
  </Step>

  <Step title="Make your first API call">
    Use the token to call the GraphQL endpoint. For example, [authorize a transaction](/acquiring/transaction-processing/authorize-customer-initiated-transaction):

    ```bash lines theme={null}
    curl --request POST \
      --url https://api.sandbox.tesouro.com/graphql \
      --header 'Content-Type: application/json' \
      --header 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
      --data '{
      "query": "mutation AuthorizeCIT($input: AuthorizeCustomerInitiatedTransactionInput!) { authorizeCustomerInitiatedTransaction(authorizeCustomerInitiatedTransactionInput: $input) { authorizationResponse { status: __typename transactionId paymentId } errors { ... on Error { message __typename } } } }",
      "variables": {
        "input": {
          "acceptorId": "YOUR_ACCEPTOR_ID",
          "transactionReference": "YOUR_UNIQUE_REFERENCE",
          "authorizationIntent": "FINAL_AUTHORIZATION",
          "channel": "ECOMMERCE",
          "paymentMethodDetails": {
            "cardWithPanDetails": {
              "expirationMonth": "09",
              "expirationYear": "2051",
              "accountNumber": "5188690009946204",
              "paymentEntryMode": "PAYMENT_METHOD_ON_FILE",
              "paymentChannel": "ECOMM",
              "securityCode": {
                "omissionReason": "VERIFICATION_NOT_REQUESTED"
              }
            }
          },
          "transactionAmountDetails": {
            "totalAmount": 100.99,
            "currency": "USD"
          },
          "automaticCapture": "NEVER"
        }
      }
    }'
    ```
  </Step>
</Steps>

## Next steps

* Learn about [authentication](/acquiring/guides/authentication/overview) concepts and available methods
* Explore the [Sandbox](/acquiring/guides/sandbox/about) environment for testing
* Review the [API concepts](/acquiring/api/concepts/environments) for environments, rate limiting, and pagination