fix: cast refund amount to string for paypal

[bseverino]

Internal ticket: https://redventures.atlassian.net/browse/RV2U-511

Merge checklist:
Check off if complete or not applicable:

• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post-merge:

• Backported to latest and next named releases

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
commerce_coordinator/apps/paypal
clients.py
commerce_coordinator/apps/paypal/tests
test_clients.py
Project Total

This report was generated by python-coverage-comment-action

[Copilot]

Pull request overview

Updates the PayPal refund request payload to ensure the refund amount is serialized as a string (matching PayPal Money.value expectations) and adds a regression test to prevent reintroducing Decimal→null serialization issues.

Changes:

• Cast refund_order(..., amount=...) to str(amount) when building the PayPal SDK request body.
• Add a PayPal client regression test asserting the request payload uses a string for the refund amount.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
commerce_coordinator/apps/paypal/clients.py	Coerces refund amount to string in the PayPal refund request body and documents the rationale.
commerce_coordinator/apps/paypal/tests/test_clients.py	Adds a regression test verifying the refund request payload shapes amount.value as a string.

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[Copilot]

Pull request overview

This PR fixes PayPal refund request serialization by ensuring the refund amount is always sent as a string (matching PayPal’s Money.value requirements and avoiding Decimal → null issues from the SDK’s jsonpickle serialization).

Changes:

• Coerce refund_order(..., amount=...) amount to str(amount) when building the PayPal request body.
• Add a regression test verifying that a Decimal refund amount is serialized as a string in the outgoing request.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
commerce_coordinator/apps/paypal/clients.py	Casts refund amount to string in the PayPal refund payload to prevent SDK serialization issues.
commerce_coordinator/apps/paypal/tests/test_clients.py	Adds a regression test asserting Decimal("49.00") is passed to PayPal as "49.00".

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