[BUG FIX] [MER-5500] Fix Playwright payment session token transport

[nicocirio]

Jira

https://eliterate.atlassian.net/browse/MER-5500

Summary

• fix the Playwright student payment login helper to send the scenario token in the x-playwright-scenario-token header
• add a focused Playwright regression spec for the helper contract
• keep the backend contract unchanged

Bug Origin

The regression was introduced in the AI review commit:
f88908e

That change hardened the backend session helper to accept the scenario token only from the x-playwright-scenario-token header, but the Playwright payment helper still sent the token in the query string. As a result, payment smoke tests could stop at /test/log_in_user instead of reaching the seeded section.

Fix

• update the Playwright helper to send the token via header instead of query params
• add a regression spec that verifies the header is present and the token query param is absent

Validation

• cd assets/automation && npx playwright test tests/torus/student_payment/support.spec.ts
• cd assets/automation && npx playwright test tests/torus/student_payment/payment-unlock.spec.ts --grep "learner unlocks a paid section with a payment code"
• mix format
• mix compile
• yarn --cwd assets run format
• yarn --cwd assets run check-types
• yarn --cwd assets run deploy

Image

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Risk score: 0 → risk/low

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AI Review —

No issues found