Add get bill endpoint with Bill type aligned to bills.json schema

[Copilot]

Adds GET /bills/:id support and a Bill type fully aligned to the bills.json schema. Previous iterations had the wrong statuses, attributes, and relationships (copied from payment types rather than the bill domain).

types/bill.ts

• BillStatus: "Draft" | "Pending" | "Scheduled" | "Paid" | "PaymentInProgress" | "FundsPushed" | "DeductionPaymentFailed" | "VendorPaymentFailed" | "RefundInitiated" | "Refunded" | "CancellationInitiated" | "Canceled" | "Archived"
• BillFailureReason: full union of ACH/check failure codes (present on DeductionPaymentFailed / VendorPaymentFailed)
• BillLineItem, PlatformPaymentMethod, ExternalPaymentMethod, BillPaymentMethod: supporting types for line items and payment scheduling
• Required attributes: status, version, createdAt, updatedAt
• Optional attributes: currency, lineItems, billDate, dueDate, invoiceNumber, description, tax, total, paymentMethod, tags, failureReason
• Relationships: org (required); vendor, customer, billFile, fee, payment, linkedAccount (optional)

resources/bills.ts

const res = await unit.bills.get("bill_id")
// res.data.type === "bill"
// res.data.attributes.status: BillStatus
// res.data.relationships.org: Relationship

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[Copilot]

Pull request overview

This pull request adds support for retrieving bill resources via the /bills/:id endpoint in the Unit Node SDK. The implementation follows established patterns in the codebase for simple resource classes with get methods, similar to Institutions and Disputes resources.

Changes:

• New Bill type definition with status union type and comprehensive attributes/relationships
• New Bills resource class with a single get(id) method
• Integration with the main Unit class to expose the bills resource
• Test coverage for both type validation and the get endpoint

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
types/bill.ts	Defines the Bill interface with BillStatus union type, standard attributes (createdAt, status, amount, description, reason, tags), and relationships (account, customer, customers, transaction)
resources/bills.ts	Implements Bills resource class extending BaseResource with a get method to retrieve a bill by ID
unit.ts	Adds Bills resource to the Unit class constructor and public properties
types/index.ts	Exports bill types for external consumption
resources/index.ts	Exports Bills resource class for external consumption
tests/bills.spec.ts	Adds tests for Bill type structure and get endpoint functionality

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[hassidtal]

@copilot look at the attributes and statuses, the types/bill.ts is not align with https://github.com/unit-finance/unit-finance/blob/master/Unit.Api/schemas/public/bills.json

[Copilot]

@copilot look at the attributes and statuses, the types/bill.ts is not align with https://github.com/unit-finance/unit-finance/blob/master/Unit.Api/schemas/public/bills.json

The unit-finance/unit-finance repository is private and not accessible to me, so I'm unable to read the bills.json schema directly. Could you share the relevant schema content (or a diff of what needs to change) so I can align the attributes and statuses correctly?