Handle experiment metadata from subscriptionSelected message

[nalcalag]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1209917212981563?focus=true

Description

Handle experiment metadata and pass to /confirm endpoint for a future Front End experiment. For the moment, this change shouldn't make any difference in the paywall

Steps to test this PR

Pre steps

• Make sure you are Privacy Pro eligible

Regression check: Paywall unaffected

• Install from branch
• Go to Settings > Privacy Pro
• Make sure paywall opens and works as expected

Experiment integration (tratment A)

• Use a VPN connected to US
• Apply patch attached in https://app.asana.com/1/137249556945/task/1210050331055612?focus=true
• Fresh install
• Go to Settings > Privacy Pro
• Check you see a new paywall design for free trials
• Subscribe to a monthly or yearly product
• Check logs to confirm that experimentName and experimentCohort are sent to in purchase/confirm request. (Filter by /confirm body in logs)

No UI changes

[nalcalag]

• Handle experiment metadata from subscriptionSelected message #5930 👈 (View in Graphite)
• develop

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