fix(ucs): adapt to optional mandate fields

[pixincreate]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Updates unified-connector-service-client and unified-connector-service-cards to the UCS branch with the proto change, and adjusts the request builders:

• MandateAmountData.amount and MandateAmountData.currency are now optional, so they are wrapped in Some.
• Fills fields added by the newer proto: connector_order_id, setup recurring capture_method, and Apple Pay merchant_token_identifier.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

Five deprecated fields in the UCS proto were still required. Making them optional keeps consumers working when they omit the deprecated fields. UCS change: juspay/hyperswitch-prism#2329

The dependency points to the UCS branch until the change is released as a tag.

How did you test it?

cargo check -p router and cargo clippy -p router pass with the branch dependency.

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/router/src/core/unified_connector_service/transformers.rs	8% smaller
Cargo.lock	Unsupported file format
crates/external_services/Cargo.toml	Unsupported file format
crates/hyperswitch_interfaces/Cargo.toml	Unsupported file format
crates/router/Cargo.toml	Unsupported file format

[XyneSpaces]

[should-fix] Cargo.toml / Cargo.lock

This PR switches the connector-service dependencies from a pinned tag to the moving branch fix/deprecated-fields-optional. That makes builds non-reproducible and lets upstream branch changes land silently. Pin to a tag or exact revision before merging.

[XyneSpaces]

[should-fix] Cargo.toml now depends on connector-service via branch = "fix/deprecated-fields-optional" instead of a pinned tag. Branch-based git dependencies can drift or be deleted, and future cargo update pulls new commits automatically. Pin to a tag or exact revision, especially for a dependency shared across external_services, hyperswitch_interfaces, and router.

unified-connector-service-client = { git = "https://github.com/juspay/connector-service", tag = "<stable-tag>", package = "rust-grpc-client" }

[XyneSpaces]

[should-fix] The PR switches the unified-connector-service-client / unified-connector-service-cards dependencies from a pinned tag (2026.09.15.0) to the moving branch fix/deprecated-fields-optional. Cargo will fetch the latest commit on that branch, making builds non-reproducible and allowing upstream changes to break this PR after it merges. Pin to a tag or specific rev before merging.

[XyneSpaces]

[blocking] Replace the branch = "fix/deprecated-fields-optional" dependency pins with a released tag or a pinned revision before merge. Branch dependencies drift and make the build non-reproducible.

Affected: crates/external_services/Cargo.toml, crates/hyperswitch_interfaces/Cargo.toml, crates/router/Cargo.toml, and the matching Cargo.lock entries.

[XyneSpaces]

🚨 Mutable git dependency branch (file:line references below; inline comments could not be posted by this automation):

• crates/external_services/Cargo.toml:97
• crates/hyperswitch_interfaces/Cargo.toml:38
• crates/router/Cargo.toml:246
• crates/router/Cargo.toml:247

The unified-connector-service-* crates are pinned to branch = "fix/deprecated-fields-optional". A mutable branch can change or be deleted, breaking reproducible builds and CI. Pin these dependencies to a validated tag or rev before merging.

[XyneSpaces]

🚨 Cargo.toml now points the UCS gRPC client and cards crates to a moving feature branch (fix/deprecated-fields-optional) instead of a pinned tag. This makes the build non-reproducible and pulls in unreleased connector-service changes.

Pin these dependencies back to a stable tag (or a specific rev) before merging; a temporary branch pointer should not land in main.

[XyneSpaces]

⚠️ Cargo dependencies were switched from a pinned tag (2026.09.15.0) to a moving branch (fix/deprecated-fields-optional) in multiple Cargo.toml files and Cargo.lock.

Branch references make the build non-reproducible and can pull in unexpected changes as the branch moves. Pin to a specific tag or commit SHA before merging, especially for the unified-connector-service-client/ucs_cards integrations.