Admin init: deploy-time configuration (token address, limits)

[greatest0fallt1me]

Description

Add initialize callable once to set global config (e.g. default token, max rate) if product requires shared deployment config.

Requirements and context

• Prevent double init.
• Auth: deployer or immutable args per Soroban pattern.

Suggested execution

• Fork the repository and create a branch (example below).
• Implement the changes in the StreamPay-Contracts Soroban crate (streampay-contracts).
• Keep the contract secure, tested, and documented; prefer small, reviewable diffs.

git checkout -b feature/contract-initialize-config

Implementation targets

• lib.rs + storage for config.
• Tests: double init fails.

Tests and validation

• Add or extend contract tests for this scope.

• Cover edge cases; paste summarized test output and security notes in the PR.

• Run cargo test in StreamPay-Contracts.

• Cover edge cases; capture test output and short security notes in the PR description.

Guidelines

• Target minimum 95% test coverage for touched contract code (or justify gaps explicitly).
• Clear documentation (rustdoc / project docs as specified).
• Timeframe: 96 hours from assignment.

Example commit message

feat(contracts): one-time initializer for global settings

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[rohan911438]

@rohan911438 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, I’d like to work on this issue. I understand the requirements and can start immediately. I’ll ensure a clean, tested implementation and a quick turnaround. Kindly assign this to me.

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Congratulations, @rohan911438! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @rohan911438: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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