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FedEx SDK for PHP

This is a PHP SDK for working with FedEx's REST APIs. The SDK is autogenerated from FedEx's OpenAPI models (with substantial model refactoring) and built on top of Saloon.

[!WARNING] This SDK has not yet been used in production, and is still very much in beta. There may very well be bugs that we haven't found yet. If you find any problems, we'd really appreciate it if you submitted an issue.

Installation

composer require shipstream/fedex-rest-sdk

Quickstart

The FedEx class is the jumping-off point for accessing all segments of the FedEx API. To get started, instantiate an instance of the FedEx class with your client ID and secret key:

To access a particular set of endpoints, get an instance of the relevant resource collection class from the connector:

To figure out which DTO(s) need(s) to be passed to a particular endpoint method, use your editor to inspect the method's arguments:

Configuration options

The FedEx class constructor accepts the following arguments:

• clientId: The OAuth client ID from the developer console. Required.
• clientSecret: The OAuth client secret from the developer console. Required.
• endpoint: An ShipStream\FedEx\Enums\Endpoint value, either Endpoint::PROD or Endpoint::SANDBOX. Defaults to Endpoint::PROD.
• childKey: If you're working with child credentials, this is the child's OAuth client ID. Optional.
• childSecret: The corresponding secret key for the child client ID, if one is provided. Optional.
• proprietaryChild: Specifies if the child credentials (if any) are for a proprietary parent/child relationship. Default false.
• tokenCache: An implementation of the TokenCache interface. This is used to cache access tokens, so that a new one isn't retrieved on every request. Defaults to the MemoryCache implementation.
• transactionIdGenerator: A closure that takes a PendingRequest and returns a string, which will be used to inject x-customer-transaction-id header values into requests. Optional.

Saloon features

Since this SDK is built on top of Saloon, it inherits Saloon's many useful built-in features, such as automatic request retries, easy request debugging, middleware, request pools, and more.

Contributing

We welcome any and all contributions! There are a few ways you can contribute to this project:

• If you find a bug or run into an issue getting set up, please search the existing issues, and open a new issue if you don't find anything that matches the problem you're having.
• Browse through the existing issues and help people out!
• Submit a pull request if you find an issue and want to fix it yourself!

Issues

Before submitting an issue, please make sure you search the existing issues to see if anyone else has already reported and/or solved the same problem you're reporting. If you don't find anything that matches your problem, submit a new issue. Please make sure to include:

• The version of the library you're running (you can find this in your composer.json file)
• Your complete code, with any credentials removed
• A thorough description of the problem
• Steps to reproduce the problem

Pull Requests

We welcome PRs! If you want to submit a PR, we encourage you to first submit an issue describing the change you want to make. That way, you don't end up in the frustrating situation of putting a lot of work into a PR only to have us reject it because it's not a change/feature we want to support.

Once you're ready to start work on your PR, please check out the SDK Design section below to make sure your changes conform to the overall design of this library.

Before submitting a PR for review, please ensure the test suite is working with composer test and that the code is linted using composer lint.

Testing

To get the tests up and running, you'll need a set of FedEx REST API sandbox credentials. Since FedEx has a fairly complete sandbox environment, we use their actual sandbox instead of mocking responses.

Once you have credentials, copy phpunit.dist.xml to phpunit.xml and fill in the CLIENT_ID and CLIENT_SECRET environment variables with your test credentials. Now you should be able to run the test suite!

Since we are using the actual sandbox API instead of mocking, make sure you use the Endpoint::SANDBOX endpoint in all tests! FedEx has separate production and sandbox credentials, so you will likely just get an error if you specify the production endpoint, but if you accidentally put production creds in phpunit.xml (see below) you will be making real API requests during testing.

SDK Design

This SDK is (almost) entirely autogenerated from FedEx's OpenAPI model files, using highsidelabs/saloon-sdk-autogenerator. As with most big multi-file OpenAPI specifications, the FedEx spec took quite a bit of massaging to get into a format that worked well with an autogenerator. We put a lot of work into making sure that the generation process, from downloading the model files to the generated code, is idempotent and reliable.

There are three major steps to building this library:

1. Downloading the raw OpenAPI schema files from FedEx
2. Combining and editing those files to make their formatting more consistent and usable
3. Generating the final code from the modified OpenAPI schema files

The details of each step are described below. Each of these steps is run via its own CLI command, defined in bin/console. The CLI commands accept the following options, both of which can accept multiple values:

• --schema: The names of the schemas to apply the command to, by their hyphenated names as defined in resources/apis.json.
• --schema-version: The schema versions to apply the command to, by their version codes as defined in resources/apis.json.

So, to download v1 of the authorization and pickup-request APIs, you can run:

Downloading schemas: php bin/console schema:download

This step is the simplest of the three. The resources/apis.json is the primary source of truth for what all the different segments of FedEx's REST API are, what their names are, and the URLs of their OpenAPI schema files. Some API segments (for instance, the Service Availability API) are composed of multiple OpenAPI model files. The apis.json file is also built to support multiple versions of the same API segment, in case FedEx later releases new versions of these APIs. There is a more complete description of the apis.json file below.

Downloaded OpenAPI models are placed in resources/models/.raw/<api-name>. Once the models for a particular API segment have been downloaded, they can then be refactored.

Refactoring schemas: php bin/console schema:refactor

A wide variety of refactoring processes are run on the raw schemas to get them ready to be used in the following step: code generation. A broad overview of the refactoring steps:

• Combine raw schemas: If a given API segment has multiple OpenAPI model files, they are combined into a single file. Routes, methods, and component schemas are aggregated across original OpenAPI files, and combined into a single model object. So far, we have not found any OpenAPI model files from the same API segment with overlapping routes, nor conflicting component schemas, so we're not handling those cases.
• Clean combined schema: There are often inconsistencies, missing elements, and duplicated or unnecessary component schemas in the OpenAPI models, so this step takes care of those issues. Some specific current steps that are taken:
  • Filling in missing 404 response schemas
  • Removing unnecessary allOf and oneOf definitions in requests, responses, and component schemas
  • Setting the types of schemas and properties that are missing explicit types
  • Flattening multi-level $refs, where a component or property is a $ref to another $ref.
  • Deduplicating component schemas by comparing properties and requirements, and combining the component schemas whenever possible
• Apply manual modifications: Certain schema changes need to be made manually, because they are too specific or too cumbersome to make using code. These modifications are defined in the resources/modifications.json file, which is explained more thoroughly below.

Once refactoring is complete, the finalized OpenAPI model file is saved to resources/models/<api-name>/<version>.json. These files are version-controlled, unlike the raw models, because having them available to everyone makes it easier to reason about the autogeneration process.

Generating code: php bin/console schema:generate

Finally, the code is generated from the finalized OpenAPI models. We use highsidelabs/saloon-sdk-generator for this, which handles most of the heavy lifting. All the code in the ShipStream\FedEx\Api namespace is autogenerate, so do not edit any of that code directly! Any changes in that namespace will be overridden the next time the library is generated, so if you want to make a change to any of that code, that change will have to be made by either a) modifying/extending the generator code, or b) via the modifications.json file.

The config.json file provides some basic configuration parameters to the autogenerator, and the files in src/Generator/Generators override highsidelabs/saloon-sdk-generator's default file generators to make minor modifications. There are several different generator files that can be overridden – you can see all of them here. If you have questions about how to go about extending or modifying the generator files, please open an issue in the highsidelabs/saloon-sdk-generator repository.

Generator control files

apis.json

This file is the source of truth for all API segments, names, versions, and upstream OpenAPI model URLs. The top-level object keys (e.g., authorization, address-validation, etc) are the names that are used to reference and retrieve a particular API segment throughout the codebase.

Each top-level sub-object is the definition for an API segment. It contains a human-readable name, and an array of version definitions. Each version consists of a version code (e.g., 1), and a url key which is either a string or an array of strings, depending on whether or not FedEx defines the API segment via a single OpenAPI model file or multiple model files.

modifications.json

This file contains manually-defined OpenAPI model modifications. These modifications are applied after all other model refactoring steps. Each modification definition has two or three elements:

• path, the dot-separated JSON path to the value to be modified in the model file
• action, which is one of the following:
  • replace: Replaces the value at path with the value in the value key (see below)
  • merge: Combines the value at path with the value in the value key
  • delete: Removes the value at path entirely, along with the final key in path, from the model
• value, the value to merge/replace. Not required if action is delete

Authors

This SDK was built in collaboration with Jesse Evers of Highside Labs.