---
kit_version: "1.0.0"
doc_id: "UMAY-DOC-03"
project_name: "UmayShop"
module: "03"
prepared_by: "compiled by example role"
content_owner: "To be assigned"
document_date: "2026-10-01"
status: "example"
language: "en"
revision_id: "en-example-r1"
source_revision_id: "example-r1"
translation_status: "machine_draft_reviewed_for_structure"
classification: "internal"
reference_eligibility: "example_only"
---

# UmayShop — 03. Backend / Backend Services

> Translation note: This English machine draft preserves the source example snapshot. Language, publication and verification checklist values inside the example are historical sample content, not the current availability of this prototype. No human language signoff or real system verification is implied.

> **fictional example**: The text below is used to demonstrate how to fill out the template, and is not the actual implementation, permissions, deployment, or approval conclusion of UmayShop. Fictional examples cannot enter verified reference material.

Explains backend responsibilities, modules, interfaces, and internal invocations, particularly how failures are handled.

[Return to Main Table of Contents](../README.md) · [Unified Completion and Verification Rules](../AUTHORING-GUIDE.md)

## Table of Contents

- [Document Information](#文档信息)
- [Applicable Scope and Verification Conclusions](#适用范围与核验结论)
- [Service Responsibilities and Technology Versions](#服务职责与技术版本)
- [External Interfaces and Data Models](#对外接口与数据模型)
- [Internal Service Calls and Data Exchange](#内部服务调用与数据交换)
- [Configuration and Runtime Dependencies](#配置与运行依赖)
- [Error Handling and Business Compensation](#错误处理与业务补偿)
- [Verification Checklist and Known Limitations](#验证清单与已知限制)
- [Visual Charts](#可视化图表)
- [Sources, Final Decision, and Code Verification](#来源-最终决策与代码核验)
- [Attachments and Image Resources](#附件与图片资源)
- [Manual maintenance area](#人工维护区)
- [Language and Download Checks](#语言与下载检查)
- [Revision History](#修改历史)
- [Related Documentation](#相关文档)

<a id="文档信息"></a>

## Document Information

| Field | Content to Fill |
| --- | --- |
| content owner / Confirmer | Pending assignment / unconfirmed; compiled by is not an automatic approver |
| Technical Lead / Target Deadline | Azong / 2026-10-19; template takes effect only after their confirmation |
| Template Version / Current Status | 1.0.0 / example; unreleased |
| Project / Compiled by | UmayShop / Example author role |
| Applicable Version / Environment | Example dataset r1 / fictional test environment |
| Code repository / Collection branch / Full fixed commit SHA | Real snapshot not obtained; fictional examples do not fill in fake fixed commit SHAs |
| Most recent confirmation time / Confirmation basis | Unconfirmed / Confirmation record not obtained |
| Access classification | internal: Internal; increase classification when restricted information is involved, inheriting source permissions |
| Language / source revision | zh-CN / example-r1; English and Russian not yet generated |


<a id="适用范围与核验结论"></a>

## Scope of Application and Verification Conclusion

| Item | Conclusion |
| --- | --- |
| Coverage scope | Explain backend responsibilities, modules, interfaces, and internal invocations, especially how to handle failures. |
| Collection exclusions | umay/cis-mep and all its subtrees are not collected, not translated, not exported, and not counted toward acceptance |
| Verified Scope | Provides fictional example entries only, private code unverified |
| Number of verified reference materials | 0; this document did not perform real Issue/source code verification |
| Evidence credibility level | Actual system conclusions: low/unknown; confirmed requirement scope: high (single user source, not code proof) |
| Limitations / Gaps | Need to supplement final decision, confirmed permissions, exact SHA, implementation location, and verification records; do not extend front-end static checks into back-end or production conclusions |


<a id="服务职责与技术版本"></a>

## Service Responsibilities and Technology Versions

> Instructions for completion: Dependency declarations and actual resolved versions in lockfiles are listed separately; do not presume the current version without evidence.

| Service / Module | Responsibility | Technical Declaration | Locked Version | Configuration Source | Owner |
| --- | --- | --- | --- | --- | --- |
| API-DEMO / OrderReader | Aggregate order summary | Example runtime 1.x | Example runtime 1.0 | EXAMPLE-CONFIG-01 | Example backend role |
| DeliveryReader | Read delivery trajectory | Example library 2.x | Example library 2.0 | EXAMPLE-CONFIG-01 | Example backend role |


<a id="对外接口与数据模型"></a>

## External Interfaces and Data Models

> Completion notes: Only reference the interface master record from Directory 09; this section describes how the service uses the data.

| Interface ID | Entry | Business Processing | Input/Output | Model | Evidence |
| --- | --- | --- | --- | --- | --- |
| API-EX-01 | GET /example/orders/{id} | Aggregate query after validating access | id → orderId, deliveryState, updatedAt; deliveryState originates from ShipmentDemo.status | OrderDemo | EXAMPLE-E03 |
| EVT-EX-01 | Example outbound warehouse processing event | Record processed results by event ID | Event / fulfillment summary | ShipmentDemo | EXAMPLE-E03 |


<a id="内部服务调用与数据交换"></a>

## Internal Service Calls and Data Exchange

> Instructions: Timeout refers to the maximum wait limit; idempotency means duplicate arrivals of the same request will not repeatedly produce business results. Each call must provide trigger, protocol, input/output, authentication, and owner.

| Caller → Callee | Trigger / Method or Channel | Input → Output | Authentication / Permissions | Timeout | Retry Count / Interval | Idempotency / Deduplication | Error Propagation / Compensation | Both Parties' Owners / Evidence |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| OrderReader → DeliveryReader | API-EX-01 query / In-process function example | orderId → deliveryState, updatedAt | Same process, inherits verified request permissions (fictional) | Example 2 seconds | Example 1 retry / interval to be confirmed | Read-only, no write side effects | Returns DEPENDENCY_TIMEOUT; does not modify final delivery state | Example backend role / EXAMPLE-E03 |
| Event handler → Inventory record module | Outbound warehouse processing event / internal event example | eventId, delta → original processing result | Source verification rules not provided | Not provided | Not provided; does not default to infinite retry | Example deduplicates by eventId | Upon failure, verify manually; do not blindly deduct inventory repeatedly | Example backend and warehouse roles / EXAMPLE-E03 |


<a id="配置与运行依赖"></a>

## Configuration and Runtime Dependencies

> Completion instructions: Record configuration names, purposes, and secure storage locations; do not write values.

| Configuration Name | Purpose | Environment Differences | Secure Storage Reference | Missing Behavior |
| --- | --- | --- | --- | --- |
| ORDER_STORE_REF | Order data source identifier | Independent per environment | EXAMPLE-SECRET-REF (not a secret) | Startup fails and logs masked error |
| REQUEST_TIMEOUT_MS | Maximum wait timeout | Must be consistent with Section 12 | Controlled configuration record | Validate valid range before use |


<a id="错误处理与业务补偿"></a>

## Error Handling and Business Compensation

> Completion instructions: Error numbers, trigger conditions, external responses, retry/manual handling, and responsibilities must correspond to each other.

| Error | Trigger | Response | Retryable | Compensation / Manual Processing | Log Fields |
| --- | --- | --- | --- | --- | --- |
| DEPENDENCY_TIMEOUT | Delivery query timeout | Example 503 / Can query later | Read-only queries can be retried according to policy | Does not modify final order status | traceId, dependency, duration |
| DUPLICATE_EVENT | Same eventId arrives again | Return existing processing result | Do not write repeatedly | Manually verify original record if necessary | eventId, originalResultId |


<a id="验证清单与已知限制"></a>

## Verification Checklist and Known Limitations

> Completion instructions: Include concurrency, exception, compatibility, and startup checks; when backend source code is missing, backend semantics must not be inferred from frontend calls.

| Check | Expected | evidence | Result | Restriction |
| --- | --- | --- | --- | --- |
| Replay of identical event | Inventory updated only once | EXAMPLE-TEST-03 | Example test description, production verification not executed | Real integration test required |
| Dependency timeout | Prompt failure and do not forge success | EXAMPLE-TEST-03 | Example | Actual time limit to be verified |


<a id="可视化图表"></a>

## Visual Diagrams

Diagrams only represent the verified scope; each key connection should be linked to a source. This is currently a fictional example and does not prove actual deployment.

### Internal Service Invocations

![Internal service call (fictional example)](../assets/internal-calls.svg)

[Maintainable diagram source](../assets/internal-calls.mmd) · [Standalone image](../assets/internal-calls.svg)


<a id="来源-最终决策与代码核验"></a>

## Sources, Final Decisions, and Code Verification

**Inclusion rules**: First confirm "what the final decision is", then verify "what the target version actually did". Issue closure, the latest comment, title, or "resolved" are not sufficient to pass. Same period only indicates candidate association, not that it has been implemented.

| Evidence ID | Source Type / Location | Read Snapshot / Time | Independence and Completeness | Current Status |
| --- | --- | --- | --- | --- |
| EXAMPLE-E03 | Fictional requirements description + fictional code clues | No authentic snapshot | Reposts from the same source do not count as independent sources; missing attachments must be marked | example_only |

| Decision ID | Issue / Comment ID / Time | Final decision and scope of application | Confirmer and permission basis | Alternative / Conflict Record | Decision Status |
| --- | --- | --- | --- | --- | --- |
| EXAMPLE-D03 | EXAMPLE-ISSUE / EXAMPLE-NOTE / fictional time point | Display unknown delivery state, do not presume delivered (fictional) | Authentic authorized confirmation records have not been obtained | Actual conflict unknown | unresolved |

| Final decision ID | Repository / Branch / fixed commit SHA | Implementation file:line number / symbol | Test or verification method / result | Code status / scope | Verifier / Time | Discrepancies and formal introduction conclusion |
| --- | --- | --- | --- | --- | --- | --- |
| EXAMPLE-D03 | Not obtained; do not use fake fixed commit SHA | Actual implementation location not obtained | Actual verification not performed | unverified / None | unverified / Unconfirmed | Must not be introduced; re-verify after supplementing evidence |

Decision status: `unresolved` (undecided), `confirmed` (validly confirmed), `superseded` (superseded). Code status: `unverified` (unverified), `partial` (partial only), `code_verified` (supported by fixed-version code), `runtime_verified` (tested and supported in target environment). **Static code support does not equal passing production execution.**

The following must be satisfied simultaneously: the final decision has been validly confirmed, there are no unresolved conflicts, relevant code coverage is complete, evidence is locatable, and manual verification records are complete, before it can be listed as verified reference material within its verified scope. Assertions involving deployment, permissions, or the real behavior of external services additionally require operational evidence from the corresponding environment. Historical decisions are retained as history and do not impersonate current rules.

| Gap ID | Missing evidence | Impact | Supplemental Owner / Deadline | Resolution Conditions |
| --- | --- | --- | --- | --- |
| GAP-03-01 | Actual decisions and code snapshot | Cannot generate verified business conclusions | Pending assignment / Pending confirmation | Complete and record verifier, time, scope, and results |


<a id="附件与图片资源"></a>

## Attachments and Image Resources

| Resource ID | Source / Ownership | Local Relative Path | Integrity / Read Status | Permission Boundary | Language Processing |
| --- | --- | --- | --- | --- | --- |
| internal-calls | This package tools/diagram_assets.py (local diagram structure definition) | ../assets/internal-calls.svg + .mmd | Locally generated; XML verifiable | internal / No external download | Chinese text inside image not translated; currently only Chinese diagram available |

Attachments must record the original file URL, file name, content checksum, read time, and access classification; access tokens or signed temporary URLs must not be saved. That a link can be opened does not mean the body has been read. Redirection to a login page, corruption, encryption, or unrecognized scans are all marked as unread. Converted text must link to original documents and images, without overwriting the originals.


<a id="人工维护区"></a>

## Manual Maintenance Area

<!-- MANUAL:START -->
To be filled: explanations, exceptions, and operational notes confirmed by the person in charge. Subsequent automatic updates must preserve this section; submit diffs when conflicting with new evidence, and do not silently delete. This initialization script will not update existing content.
<!-- MANUAL:END -->


<a id="语言与下载检查"></a>

## Language and Download Checks

| Check Item | Current Status / Requirement |
| --- | --- |
| Chinese source | This page is in Chinese; source revision fixed by revision_id |
| English / Russian | Not generated. Subsequent automated translations bind to Chinese source revision (source_revision_id); after the source text is updated, old translations are marked as stale |
| Content structure | Translation preserves heading hierarchy, table of contents, tables, code, links, fields, and numerical values; terminology follows the project glossary |
| Images and In-Image Text | Original images and local assets are retained; Chinese text inside images must be separately remade or provided with translation notes; untranslated images are not counted as complete translations |
| Markdown download | When images are included, download as a ZIP containing Markdown + assets + resource manifest; must not provide only invalid remote links |
| PDF Download | Platform must implement pagination, table of contents/bookmarks, tables, Chinese/English/Russian fonts, and local image embedding; missing images should block complete success |
| Export and permissions | Bind document revision, language, image version, and template version; inherit source permissions and do not disclose restricted content |
| Package capability boundary | Only generates Markdown document tree and local diagram source/SVG; does not perform translation, PDF rendering, login, or platform publishing |


<a id="修改历史"></a>

## Revision History

| Revision | Date | Compiled by | Changes | Confirmation / Basis |
| --- | --- | --- | --- | --- |
| example-r1 | 2026-10-01 | Compiled by example role | Initialize fictional example | Unconfirmed / Template 1.0.0 |


<a id="相关文档"></a>

## Related Documents

- [09. API / Interfaces and System Integration](../09-api-integrations/README.md)
- [10. Databases and Data Models](../10-database/README.md)
- [12. Monitoring, Logging, and Error Handling](../12-observability/README.md)
- [13. Deployment and Version Release Notes](../13-deployment-releases/README.md)