chore: fix method naming

[turip]

Overview

Fix missleading getter method name.

Notes for reviewer

Summary by CodeRabbit

• Refactor
  • Standardized charge retrieval API naming across billing services (flat-fee, usage-based, and credit purchase charges) to improve internal consistency.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR systematically renames charge retrieval API methods from GetByIDs to GetByMetas across the flatfee, usagebased, and creditpurchase billing modules, including corresponding input type and validation method renames.

Changes

Cohort / File(s)	Summary
CreditPurchase Adapter & Service openmeter/billing/charges/creditpurchase/adapter.go, openmeter/billing/charges/creditpurchase/adapter/charge.go, openmeter/billing/charges/creditpurchase/service.go, openmeter/billing/charges/creditpurchase/service/get.go	Renamed GetByIDs method to GetByMetas and input type GetByIDsInput to GetByMetasInput across interfaces, implementations, and service methods. Validation logic and internal control flow unchanged.
FlatFee Adapter & Service openmeter/billing/charges/flatfee/adapter.go, openmeter/billing/charges/flatfee/adapter/charge.go, openmeter/billing/charges/flatfee/service.go, openmeter/billing/charges/flatfee/service/get.go	Renamed GetByIDs method to GetByMetas and input type GetByIDsInput to GetByMetasInput across interfaces, implementations, and service methods. Validation logic and internal control flow unchanged.
UsageBased Adapter & Service openmeter/billing/charges/usagebased/adapter.go, openmeter/billing/charges/usagebased/adapter/charge.go, openmeter/billing/charges/usagebased/service.go, openmeter/billing/charges/usagebased/service/get.go	Renamed GetByIDs method to GetByMetas and input type GetByIDsInput to GetByMetasInput across interfaces, implementations, and service methods. Validation logic and internal control flow unchanged.
Main Service Integration openmeter/billing/charges/service/get.go	Updated service method calls to use GetByMetas with corresponding input types (GetByMetasInput) for flatfee, usagebased, and creditpurchase services.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• #3943: Introduced the per-type adapters and services with the original GetByIDs methods that are being renamed in this PR
• #3952: Contains overlapping changes renaming charge retrieval APIs from GetByIDs to GetByMetas across the same modules

Suggested labels

release-note/misc, area/billing

Suggested reviewers

• tothandras
• GAlexIHU

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: renaming GetByIDs methods to GetByMetas across multiple charge service modules for improved semantic clarity.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fix-metod-naming

📝 Coding Plan

• Generate coding plan for human review comments

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