Fiserv Python API Docs | dltHub

Fiserv Payments Gateway API is a REST service for payment processing, including card and account verification. The REST API base URL is https://prod.api.firstdata.com/ipp/payments-gateway/v2 and Requests require an API key header plus timestamp and message‑signature headers..

dlt is an open-source Python library that handles authentication, pagination, and schema evolution automatically. dlthub provides AI context files that enable code assistants to generate production-ready pipelines. Install with uv pip install "dlt[workspace]" and start loading Fiserv data in under 10 minutes.

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What data can I load from Fiserv?

Here are some of the endpoints you can load from Fiserv:

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How do I authenticate with the Fiserv API?

Authentication is performed via an api-key header. Each request must also include client-request-id, timestamp, and message-signature headers together with Content-Type: application/json.

1. Get your credentials

1. Log in to the Fiserv Developer Portal.
2. Navigate to API Keys or Credentials section.
3. Click Create New API Key.
4. Copy the generated key and store it securely.
5. Use this key in the api-key header for all requests.

2. Add them to .dlt/secrets.toml

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[sources.fiserv_verify_card_source]
api_key = "your_api_key_here"

dlt reads this automatically at runtime — never hardcode tokens in your pipeline script. For production environments, see setting up credentials with dlt for environment variable and vault-based options.

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How do I set up and run the pipeline?

Set up a virtual environment and install dlt:

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uv venv && source .venv/bin/activate
uv pip install "dlt[workspace]"

1. Install the dlt AI Workbench:

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dlt ai init --agent <your-agent> # <agent>: claude | cursor | codex

This installs project rules, a secrets management skill, appropriate ignore files, and configures the dlt MCP server for your agent. Learn more →

2. Install the rest-api-pipeline toolkit:

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dlt ai toolkit rest-api-pipeline install

This loads the skills and context about dlt the agent uses to build the pipeline iteratively, efficiently, and safely. The agent uses MCP tools to inspect credentials — it never needs to read your secrets.toml directly. Learn more →

3. Start LLM-assisted coding:

Use /find-source to load data from the Fiserv API into DuckDB.

The rest-api-pipeline toolkit takes over from here — it reads relevant API documentation, presents you with options for which endpoints to load, and follows a structured workflow to scaffold, debug, and validate the pipeline step by step.

4. Run the pipeline:

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python fiserv_verify_card_pipeline.py

If everything is configured correctly, you'll see output like this:

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Pipeline fiserv_verify_card_pipeline load step completed in 0.26 seconds
1 load package(s) were loaded to destination duckdb and into dataset fiserv_verify_card_data
The duckdb destination used duckdb:/fiserv_verify_card.duckdb location to store data
Load package 1749667187.541553 is LOADED and contains no failed jobs

Inspect your pipeline and data:

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dlt pipeline fiserv_verify_card_pipeline show

This opens the Pipeline Dashboard where you can verify pipeline state, load metrics, schema (tables, columns, types), and query the loaded data directly.

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Python pipeline example

This example loads card_verification and account_verification from the Fiserv API into DuckDB. It mirrors the endpoint and data selector configuration from the table above:

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import dlt
from dlt.sources.rest_api import RESTAPIConfig, rest_api_resources

@dlt.source
def fiserv_verify_card_source(api_key=dlt.secrets.value):
    config: RESTAPIConfig = {
        "client": {
            "base_url": "https://prod.api.firstdata.com/ipp/payments-gateway/v2",
            "auth": {
                "type": "api_key",
                "api_key": api_key,
            },
        },
        "resources": [
            {"name": "card_verification", "endpoint": {"path": "card-verification"}},
            {"name": "account_verification", "endpoint": {"path": "account-verification"}}
        ],
    }
    yield from rest_api_resources(config)


def get_data() -> None:
    pipeline = dlt.pipeline(
        pipeline_name="fiserv_verify_card_pipeline",
        destination="duckdb",
        dataset_name="fiserv_verify_card_data",
    )
    load_info = pipeline.run(fiserv_verify_card_source())
    print(load_info)

To add more endpoints, append entries from the resource table to the "resources" list using the same name, path, and data_selector pattern.

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How do I query the loaded data?

Once the pipeline runs, dlt creates one table per resource. You can query with Python or SQL.

Python (pandas DataFrame):

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import dlt

data = dlt.pipeline("fiserv_verify_card_pipeline").dataset()
sessions_df = data.card_verification.df()
print(sessions_df.head())

SQL (DuckDB example):

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SELECT * FROM fiserv_verify_card_data.card_verification LIMIT 10;

In a marimo or Jupyter notebook:

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import dlt

data = dlt.pipeline("fiserv_verify_card_pipeline").dataset()
data.card_verification.df().head()

See how to explore your data in marimo Notebooks and how to query your data in Python with dataset.

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What destinations can I load Fiserv data to?

dlt supports loading into any of these destinations — only the destination parameter changes:

Change the destination in dlt.pipeline(destination="snowflake") and add credentials in .dlt/secrets.toml. See the full destinations list.

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Troubleshooting

Authentication failures

• Cause: Missing or incorrect api-key header, invalid timestamp or message-signature.
• Resolution: Ensure the API key is correct, timestamp is current (UTC), and the signature is generated as documented.

Rate limiting

• Cause: Exceeding the allowed number of requests per minute.
• Resolution: Implement exponential back‑off and respect Retry-After headers returned with HTTP 429 responses.

Invalid payload / Validation errors

• Cause: Required fields missing or incorrectly formatted in the JSON body.
• Resolution: Verify the request payload matches the schema shown in the API documentation (e.g., card number, expiration date, etc.).

Ensure that the API key is valid to avoid 401 Unauthorized errors. Also, verify endpoint paths and parameters to avoid 404 Not Found errors.

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Next steps

Continue your data engineering journey with the other toolkits of the dltHub AI Workbench:

• data-exploration — Build custom notebooks, charts, and dashboards for deeper analysis with marimo notebooks.
• dlthub-runtime — Deploy, schedule, and monitor your pipeline in production.

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dlt ai toolkit data-exploration install
dlt ai toolkit dlthub-runtime install

• How to deploy a pipeline
• How to explore your data in marimo Notebooks
• How to query your data in Python with dataset
• Join the dlt community on Slack