[CENTRAL_LEDGER] Harden the Central Ledger - prepare flow for FX

[PaulGregoryBaker]

Goal:

As a Mojaloop Community member making use of FX conversion in mojaloop I want to ensure that the FX implementation POC is standardized so that it can be merged into master and ultimately included in a release of mojaloop and used.

Note: This story covers the harnening of the central services components that are associated with the prepare leg a FX transfer and transfer for FX.

The followin components need to be addressed in this story.

• [ ] prepare handler
• [ ] postion prepare handler (This excludes timeouts and aborts, as they are captured in another story.)

Acceptance Criteria:

• [ ] Verify that error cases are mapped and documented.
• [ ] Verify that the integration test are added to test the error cases.
• [ ] Verify that unit test are added
• [ ] Verify that all mojaloop core standards are met

Complexity: <High|Medium|Low> > A short comment to remind the reason for the rating

Uncertainty: <High|Medium|Low> > A short comment to remind the reason for the rating

---

This hardening pertains to prepare payer initiatied conversion hardening - SEND type transfer.

Tasks:

• [x] Add unit tests domain/prepare handler [@kleyow]
• [x] Add in error cases to inform users of unsupported features as payee conversion. [@kleyow]
• [x] Add integration tests domain/prepare handler [@kleyow]
• [x] Refactor position prepare handler logic in batch mode [@vijayg10 ]
• [x] Add integration tests domain/prepare-position handler [@vijayg10 ]
• [x] Add unit tests domain/prepare-position handler [@vijayg10 ]
• [x] Add function test for FX transfer as part of CICD pipeline [@kleyow]
• [x] Evaluate error cases

Done

• [ ] Acceptance Criteria pass
• [ ] Designs are up-to date
• [ ] Unit Tests pass
• [ ] Integration Tests pass
• [ ] Code Style & Coverage meets standards
• [ ] Changes made to config (default.json) are broadcast to team and follow-up tasks added to update helm charts and other deployment config.
• [ ] TBD

Pull Requests:

• [x] https://github.com/mojaloop/central-ledger/pull/1004
• [x] https://github.com/mojaloop/central-ledger/pull/1005'
• [x] https://github.com/mojaloop/central-ledger/pull/1009
• [x] https://github.com/mojaloop/ml-core-test-harness/pull/54

Follow-up:

• N/A

Dependencies:

• N/A

Accountability:

• Owner: TBC
• QA/Review: TBC

[vijayg10]

[chris-me-law]

(Planning 1\2 Pt left)