Install the SwG client API library

[nfmohit]

Feature Description

The client library for the subscribewithgoogle API that is needed by Reader Revenue Manager is not available via the googleapis/google-api-php-client-services package. As a temporary workaround, this client library bindings should be generated and installed for PHP which we can later remove once available in the official client services.

• See relevant section in the design doc.
• See #5650 which was a similar effort for the former Thank with Google epic.

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Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• The PHP client library files for the subscribewithgoogle v1 API should be generated and added as a new Composer package under /packages/apiclient-services-subscribewithgoogle.
  • A single SubscribewithGoogle.php will be generated which can live in the root.
  • The package name should be google/apiclient-services-subscribewithgoogle.
• The plugin should be updated to require the new package as non-dev Composer dependency.
• The added client library files should be prefixed just like any other client service, with the production code using the generated prefixed versions under /third-party/google/.

Implementation Brief

• [x] Generate client library file SubscribewithGoogle.php under the path in the AC and create the necessary composer.json in the same directory. Refer to the generator readme.
• [x] Add a new definition under the main composer.json for the plugin to define a new path type Composer repository for the new package. This can go next to the current packages/apiclient-services-adsenselinks definition.
• [x] Update PHP Scoper configuration to include the added package.

Note: Refer this PR from "Thank with Google" which has similar implementation.

Test coverage

• Add a basic test ensuring the new prefixed dependencies are present

QA Brief

• N/A – automated tests should be sufficient for this

Changelog entry

• Add the Subscribe with Google PHP client library.

[kuasha420]

AC :white_check_mark:

[techanvil]

IB :white_check_mark:

[ankitrox]

As per my conversation with @aaemnnosttv , the generator is part of the same (maintained) client services repo, thus this is what we should use for the generation.

@aaemnnosttv I am assigning this to you for your confirmation. Once you get a chance to look into this, please confirm if we can move this ticket to CR.

Thanks

[techanvil]

As discussed on Slack the approach has been confirmed to be correct. I've given the PR another once-over with this in mind, and it's back with @ankitrox with a few more comments.

[ankitrox]

Thank you @techanvil .

I've made the requested changes. Assigning this to you for re-review.

[techanvil]

As per the QAB, there's no need for a QA stage for this. With tests passing it's been CR'd, merged and moved straight to Approval.