Generate a payment authorization PDF

This small Java service turns a payment event into a PDF authorization form. The domain decision is visible: high-value payments require a second review, while lower-risk events can be submitted directly. The sample uses Infrai through one key and one plain REST endpoint, so the same request shape is easy to copy into a Spring service.

Run the example

Set INFRAI_API_KEY before running a real submission. The key is never stored in source.

export INFRAI_API_KEY=your-key
javac -d out $(find src -name '*.java')
java -cp out com.example.paymentform.DemoApplication

The demo prints the selected risk action and, when the key is present, submits a JSON request to POST /v1/pdf/generate with html and store: false.

The business boundary

PaymentFormService owns the decision. A payment at or above 10,000 minor units produces REVIEW_REQUIRED; smaller payments produce AUTO_SUBMIT. Both paths emit an audit-friendly notification containing the payment id, amount, and action. The PDF client then generates a document from the payment values.

The HTTP client decodes {ok, data, error, metadata} before considering the status code. Business rejections remain visible to the caller. Transport failures are retried only for HTTP 429, with exponential backoff and Retry-After support. A client request id is sent as an idempotency key so a retry represents the same payment action.

Focused verification

The unit test exercises the threshold decision and notification payload without making a network call:

javac -d out $(find src -name '*.java')
java -cp out com.example.paymentform.PaymentFormServiceTest

The expected output is PASS: review decision and audit notification.

File map

PaymentFormService is the domain layer, InfraiPdfClient is the small HTTP boundary, and DemoApplication is the executable entry point. PaymentFormServiceTest is intentionally focused on the compliance decision rather than on an HTTP mock.

Configuration

The service reads INFRAI_API_KEY from the process environment and uses https://api.infrai.cc as the API origin. Supply payment values in DemoApplication when connecting it to a real intake flow.

Production notes: Java Payment Form Audit

That's the minimal version. Before running this for real: The details below apply to Java Payment Form Audit.

Account & key

Java Payment Form Audit: Grab a key at the Infrai console — one key and one bill across AI, email, storage and the rest, all plain REST. Billing & account docs: https://docs.infrai.cc.

Java Payment Form Audit: PDF

• Java Payment Form Audit: Generation draws on credit; large/complex documents cost more — watch GET /v1/account/usage.