Added payment app

[HuanCC666]

Description

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (code restructuring without changing behavior)
• Documentation update
• Test coverage improvement
• Performance improvement
• Chore (dependency updates, CI/CD, tooling)

Related Issues

Closes #

Related Design Documents

Component

• Core (All files in the root pas, e.g. pas/environment.py)
• Agents (All files in pas/agents/)
• Scenarios (All files in pas/scenarios/)
• Scenario Generator (All files in pas/scenario_generator/)
• Apps (All files in pas/apps/)
• Documentation (Documentation files e.g., docs/, mkdocs.yml, README.md)
• Testing Infrastructure
• Other

Changes Made

-Updated payment app and tests
-Updated payment docs

Breaking Changes

• This PR introduces breaking changes
• Migration guide included (if applicable)

Details:

Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• All tests pass locally (make test or uv run pytest)
• Test coverage maintained or improved

Manual Testing

Test steps:
1.
2.
3.

Test environment:

• OS:
• Python version:
• Relevant models used (if applicable):

Code Quality

• Pre-commit hooks pass (see output below)
• No dependency issues (uv run deptry pas)
• Code follows project style guidelines (f-strings, Google docstrings, etc.)

Pre-commit output:

Documentation

• Docstrings added/updated (Google style)
• mkdocs documentation updated (if applicable)
• Design documents updated (if implementation diverged from plan)
• README updated (if user-facing changes)

Checklist

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have commented complex/non-obvious code sections
• My changes generate no new warnings
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• Any dependent changes have been merged and published

Screenshots/Logs (if applicable)