@cargozone/amazon-sp-api v0.0.4

amazon-sp-api (client for the Amazon Selling Partner API)

The client handles calls to the Amazon Selling Partner API. It wraps up all the necessary stuff such as requesting access token, security token and signing requests with AWS4 signature.

Contents

• Prerequisites
• Installation
• Getting Started
  • Setting credentials from environment variables
  • Setting credentials from file
  • Setting credentials from constructor config object
• Usage
  • Config params
  • Exchange an authorization code for a refresh token
  • Request access token and role credentials manually
• Call the API
  • Examples
  • Endpoints
  • Versions
    • Version specific operation implementations
    • Defining endpoints versions on class level
    • Fallback
  • Unsupported endpoints/versions/operations
  • Grantless operations
  • Restore rates
• Download, decrypt and unzip reports
• Encrypt and upload feeds
• TypeScript Support
• Sandbox mode
• Known Issues
• Seller Support

Prerequisites

Make sure that you followed the Selling Partner API Developer Guide and have successfully completed the steps Registering as a developer, Registering your application and have a valid refresh token (if you use the client only for your own seller account the easiest way is using the self authorization as described in the developer guide).

Installation

npm install amazon-sp-api

Getting Started

Before you can use the client you need to add your app client and aws user credentials.

Setting credentials from environment variables

• SELLING_PARTNER_APP_CLIENT_ID=<YOUR_APP_CLIENT_ID> (see SP Developer Guide "Viewing your developer information")
• SELLING_PARTNER_APP_CLIENT_SECRET=<YOUR_APP_CLIENT_SECRET> (see SP Developer Guide "Viewing your developer information")
• AWS_SELLING_PARTNER_ACCESS_KEY_ID or AWS_ACCESS_KEY_ID=<YOUR_AWS_USER_ID> (see SP Developer Guide "Create an IAM user")
• AWS_SELLING_PARTNER_SECRET_ACCESS_KEY or AWS_SECRET_ACCESS_KEY=<YOUR_AWS_USER_SECRET> (see SP Developer Guide "Create an IAM user")
• AWS_SELLING_PARTNER_ROLE=<YOUR_AWS_SELLING_PARTNER_API_ROLE> (see SP Developer Guide "Create an IAM role")

Setting credentials from file

Instead of setting the credentials via environment variables you may load them from a credentials file. The default path to the file is ~/.amzspapi/credentials (path can be changed when creating a client) and you add the credentials one per line:

SELLING_PARTNER_APP_CLIENT_ID=<YOUR_APP_CLIENT_ID>
SELLING_PARTNER_APP_CLIENT_SECRET=<YOUR_APP_CLIENT_SECRET>
AWS_ACCESS_KEY_ID=<YOUR_AWS_USER_ID>
AWS_SECRET_ACCESS_KEY=<YOUR_AWS_USER_SECRET>
AWS_SELLING_PARTNER_ROLE=<YOUR_AWS_SELLING_PARTNER_API_ROLE>

Setting credentials from constructor config object

Although the most convenient and recommended way of setting the credentials is via environment variables or config file it is also possible to pass the credentials inside the config object when creating an instance of the client (i.e. if you have no means of using env vars or a config file). The structure of the constructor config object will be explained below.

Usage

Require library:

const SellingPartnerAPI = require('amazon-sp-api');

Create client and call API:

(async() => {
  try {
    let sellingPartner = new SellingPartnerAPI({
      region:'eu', // The region to use for the SP-API endpoints ("eu", "na" or "fe")
      refresh_token:'<REFRESH_TOKEN>' // The refresh token of your app user
    });
    let res = await sellingPartner.callAPI({
      operation:'getMarketplaceParticipations',
      endpoint:'sellers'
    });
    console.log(res);
  } catch(e){
    console.log(e);
  }
})();

Config params

The class constructor takes a config object with the following structure as input:

{
  region:'<REGION>',
  refresh_token:'<REFRESH_TOKEN>',
  access_token:'<ACCESS_TOKEN>',
  role_credentials:{
    id:'<TEMPORARY_ROLE_ACCESS_ID>',
    secret:'<TEMPORARY_ROLE_ACCESS_SECRET>',
    security_token:'<TEMPORARY_ROLE_SECURITY_TOKEN>'
  },
  endpoints_versions:{
    ...
  },
  credentials:{
    SELLING_PARTNER_APP_CLIENT_ID:'<APP_CLIENT_ID>',
    SELLING_PARTNER_APP_CLIENT_SECRET:'<APP_CLIENT_SECRET>',
    AWS_ACCESS_KEY_ID:'<AWS_USER_ID>',
    AWS_SECRET_ACCESS_KEY:'<AWS_USER_SECRET>',
    AWS_SELLING_PARTNER_ROLE:'<AWS_SELLING_PARTNER_API_ROLE>'
  },
  options:{
    credentials_path:'~/.amzspapi/credentials',
    auto_request_tokens:true,
    auto_request_throttled:true,
    version_fallback:true,
    use_sandbox:false,
    only_grantless_operations:false
  }
}

Valid properties of the config object:

Valid properties of the config options:

Exchange an authorization code for a refresh token

If you already have a refresh token you can skip this step. If you only want to use the API for your own seller account you can just use the self authorization to obtain a valid refresh token.

If you want to exchange an authorization code of a seller you can use the .exchange() function of the client. The neccessary authorization code is returned to your callback URI as spapi_oauth_code when a seller authorizes your application (see authorization workflow in docs) or via a call to the getAuthorizationCode operation if you want to authorize a seller for the SP-API who has previously authorized you for the MWS API (the getAuthorizationCode workflow is explained in the Grantless operations section).

Once you have obtained the authorization_code you can exchange it for a refresh token:

let sellingPartner = new SellingPartnerAPI({
  region:'eu',
  options:{
    only_grantless_operations:true
  }
});
let res = await sellingPartner.exchange('<SELLER_AUTHORIZATION_CODE>');
console.log(res.refresh_token);

NOTE: You will have to create a new class instance once you have obtained the refresh_token and pass it inside the constructor in order to make calls to the API.

Request access token and role credentials

If you only provide the region and refresh_token parameters the client will automatically request access_token and role_credentials for you (with a TTL of 1 hour) and reuse these for future api calls for the class instance.

Instead of having the client handle the access_token and role_credentials requests automatically, you may also refresh them manually:

let sellingPartner = new SellingPartnerAPI({
  region:'eu',
  refresh_token:'<REFRESH_TOKEN>',
  options:{
    auto_request_tokens:false
  }
});
await sellingPartner.refreshAccessToken();
await sellingPartner.refreshRoleCredentials();

If you want to use the same credentials for multiple instances you can retrieve them via getters and use them as input for a new instance:

let access_token = sellingPartner.access_token;
let role_credentials = sellingPartner.role_credentials;

let sellingPartnerNewInstance = new SellingPartnerAPI({
  region:'eu',
  refresh_token:'<REFRESH_TOKEN>',
  access_token:access_token,
  role_credentials:role_credentials
});

Call the API

All calls to the SP-API will be triggered by using the .callAPI() function, which takes an object with the following structure as input:

{
  operation:'<OPERATION_TO_CALL>',
  endpoint:'<ENDPOINT_OF_OPERATION>',
  path:{
    ...
  },
  query:{
    ...
  },
  body:{
    ...
  },
  api_path:'<FULL_PATH_OF_OPERATION>',
  method:'GET',
  restricted_data_token:'<RESTRICTED_DATA_TOKEN>',
  options:{
    version:'<OPERATION_ENDPOINT_VERSION>',
    raw_result:false
  }
}

Valid properties of the object:

Valid properties of the config options:

Examples

To call an operation of an API endpoint you pass in the operation and the endpoint it belongs to. See the following example:

let res = await sellingPartner.callAPI({
  operation:'getMarketplaceParticipations',
  endpoint:'sellers'
});

Instead of using the endpoint property you may also prepend the endpoint to the operation as shorthand dot notation:

let res = await sellingPartner.callAPI({
  operation:'sellers.getMarketplaceParticipations'
});

Here are a few examples that use some more properties:

let res = await sellingPartner.callAPI({
  operation:'getOrderMetrics',
  endpoint:'sales',
  query:{
    marketplaceIds:['A1PA6795UKMFR9'],
    interval:'2020-10-01T00:00:00-07:00--2020-10-01T20:00:00-07:00',
    granularity:'Hour'
  }
});

let res = await sellingPartner.callAPI({
  operation:'catalogItems.getCatalogItem',
  path:{
    asin:'B084J4QQFT'
  },
  query:{
    MarketplaceId:'A1PA6795UKMFR9'
  },
  options:{
    version:'v0'
  }
});

let res = await sellingPartner.callAPI({
  operation:'createReport',
  endpoint:'reports',
  body:{
    reportType:'GET_FLAT_FILE_OPEN_LISTINGS_DATA',
    marketplaceIds:['A1PA6795UKMFR9']
  }
});

let res = await sellingPartner.callAPI({
  operation:'finances.listFinancialEvents',
  query:{
    PostedAfter:'2020-03-01T00:00:00-07:00',
    PostedBefore:'2020-03-02T00:00:00-07:00'
  },
  options:{
    raw_result:true
  }
});

NOTE: As the original design of the client (< v0.4.0) didn't keep in mind the possibility of having the exact same operation name for multiple endpoints (i.e. getShipment, see Issue #33) and multiple versions of the same endpoint, we had to replace original operation-only based calls to the API with a new concept that includes endpoints and version-specific operation calls. This concept comes without any breaking changes, so you can still safely upgrade from any version below 0.4.0 to the latest version, but the use of .callAPI() without specifying an endpoint is considered deprecated, is discouraged and will trigger a console warning.

Endpoints

The exact endpoint's name of an operation will be the references name (see SP API References) without - and api and continued with a capital letter. So the catalog-items-api endpoint's name will be catalogItems, fba-small-and-light-api will be fbaSmallAndLight, sellers-api will be sellers and so on. You can also retrieve the endpoint names and their operations and versions by calling sellingPartner.endpoints.

Versions

Every operation belongs to an endpoint that consists of one or more versions and each version consists of one or more operations. You will find a complete list of the endpoints with all versions and operations here in the Selling Partner API Docs. For a complete list of all currently by the client supported endpoints with versions and operations you can just call sellingPartner.endpoints.

Version specific operation implementations

The client uses the first (in fact the oldest) endpoint version if no version is provided since new versions of some operations are not backward compatible. So in order to prevent breaking changes we can't enable latest endpoint versions by default. I.e. the two different implementations of the getCatalogItem operation (see catalogItemsV0 vs. catalogItems_2020-12-01) expect different input parameters and return different results.

The implementation of the getCatalogItem operation in the v0 version expects an asin and a MarketplaceId as input:

let res = await sellingPartner.callAPI({
  operation:'getCatalogItem',
  endpoint:'catalogItems',
  query:{
    MarketplaceId:'A1PA6795UKMFR9'
  },
  path:{
    asin:'B084DWG2VQ'
  },
  options:{
    version:'v0'
  }
});

In contrast, the implementation of the getCatalogItem operation in the 2020-12-01 version expects an asin, a marketplaceIds array and an includedData array as input:

let res = await sellingPartner.callAPI({
  operation:'getCatalogItem',
  endpoint:'catalogItems',
  query:{
    marketplaceIds:['A1PA6795UKMFR9'],
    includedData:['identifiers', 'images', 'productTypes', 'salesRanks', 'summaries', 'variations']
  },
  path:{
    asin:'B084DWG2VQ'
  },
  options:{
    version:'2020-12-01'
  }
});

Trying to call the new 2020-12-01 version without explicitly setting it would result in an InvalidInput error as the required MarketplaceId parameter is missing.

Defining endpoints versions on class level

There are different ways of specifying the version to use for endpoints and their corresponding operations. You can specify the version directly inside the options object of the .callAPI() function as seen in the examples above. But you can also enable a newer version for all operations of an endpoint by using the endpoints_versions setting in the constructor config object. I.e. you can tell the class instance to use the new 2020-12-01 version for the catalogItems endpoint and thus enabling it for all operations of the endpoint throughout the class instance like this:

  let sellingPartner = new SellingPartnerAPI({
    region:'eu',
    refresh_token:'<REFRESH_TOKEN>',
    endpoints_versions:{
      'catalogItems':'2020-12-01'
    }
  });

By doing so you can skip setting the version inside the options object each time when you are using .callAPI() with the new version of the getCatalogItem operation.

Fallback

If trying to call an operation that is not part of the endpoint's version you specified, the client will automatically try to find the operation in an earlier endpoint's version and use that implementation if version_fallback is set to true (which is the default). I.e. the listCatalogCategories operation is not part of the new catalogItems endpoint version. So if the new version was set as in the example code above, the following call would still work, because it will automatically fallback to the operation's implementation in version v0:

let res = await sellingPartner.callAPI({
  operation:'listCatalogCategories',
  endpoint:'catalogItems',
  query:{
    MarketplaceId:'A1PA6795UKMFR9',
    ASIN:'B084DWG2VQ'
  }
});

Unsupported endpoints/versions/operations

The newest client version should have full support for all endpoints, versions and operations on release, however it might lack support for very recently added new endpoints, versions or operations. If you need an endpoint/version/operation that is not yet supported you can still call it by using the api_path parameter. I.e. if the new catalogItems version 2020-12-01 would not be supported yet we could still use the new implementation of the getCatalogItem operation by using the api_path and method properties:

let res = await sellingPartner.callAPI({
  api_path:'/catalog/2020-12-01/items/B084DWG2VQ',
  method:'GET',
  query:{
    marketplaceIds:['A1PA6795UKMFR9'],
    includedData:['identifiers', 'images', 'productTypes', 'salesRanks', 'summaries', 'variations']
  }
});

Grantless operations

Some operations don't require an explicit authorization by a seller, see list of grantless operations. A grantless operation needs another access token than other operations and as such a grantless token is NOT the access_token you can provide in the constructor config object. However if the auto_request_tokens option is set to true the client should handle everything for you.

If you do the token request manually you need to create a grantless token by calling refreshAccessToken with the scope of the corresponding endpoint. Currently there are only two different scopes: sellingpartnerapi::migration for authorization endpoint and sellingpartnerapi::notifications for notifications endpoint.

If you don't need or have a refresh token (i.e. because you want to retrieve an SP API authorization code of an already via MWS authorized seller) you may use the client with the only_grantless_operations option set to true which allows you to create an instance of the client without a refresh_token.

To sum up, please see the following example that will request an auth code for an authorized MWS seller account.

First create a class instance that only allows to call grantless operations (no refresh_token included):

let sellingPartner = new SellingPartnerAPI({
  region:'eu',
  options:{
    auto_request_tokens:false,
    only_grantless_operations:true
  }
});

Then request a grantless token with the scope needed for the operation you want to call and refresh the role credentials:

await sellingPartner.refreshAccessToken('sellingpartnerapi::migration');
await sellingPartner.refreshRoleCredentials();

Finally call the grantless operation:

let res = await sellingPartner.callAPI({
  operation:'getAuthorizationCode',
  endpoint:'authorization',
  query:{
    sellingPartnerId:'<YOUR_CUSTOMERS_SELLER_ID>',
    developerId:'<YOUR_DEVELOPER_ID>',
    mwsAuthToken:'<YOUR_CUSTOMERS_MWS_TOKEN>'
  }
});

Restore rates

If you set the auto_request_throttled option in the class constructor config object to true (which is the default), the client will automatically retry the call if its throttled. It will either use the restore rate from the result header field x-amzn-ratelimit-limit if given (see Usage Plans and Rate Limits) or otherwise use the default restore rate of the operation. If you set auto_request_throttled to false the client will throw a QuotaExceeded error when a request is throttled.

NOTE: If you are using the same operation with the same seller account across multiple class instances the restore rate logic might NOT work correct or, even worse, result in an infinite quota exceeded loop. So if you're planning to do that you should probably set auto_request_throttled to false, catch the QuotaExceeded errors and handle the restore rate logic on your own.

Download, decrypt and unzip reports

The .download() function takes the download details (url and encryption details) received from a getReportDocument operation as input, downloads the content, unzips it (if result is compressed), decrypts it and returns it.

Retrieve the download details from a getReportDocument operation:

let report_document = await sellingPartner.callAPI({
  operation:'getReportDocument',
  endpoint:'reports',
  path:{
    reportDocumentId:'<REPORT_DOCUMENT_ID>' // retrieve the reportDocumentId from a "getReport" operation (when processingStatus of report is "DONE")
  }
});

The structure of the returned report_document should look like this:

{
  reportDocumentId:'<REPORT_DOCUMENT_ID>',
  compressionAlgorithm:'GZIP', // Only included if report is compressed
  encryptionDetails:{ // Only included if old reports endpoint version used (2020-09-04)
    standard:'AES',
    initializationVector:'<INITIALIZATION_VECTOR>',
    key:'<KEY>'
  },
  url: '<REPORT_DOWNLOAD_URL>' // Expires after 5 minutes!
}

Call the .download() function to receive the content of the report. The default without any config options will download, decrypt and unzip the content and return it without reformatting or saving it to the disk:

let report = await sellingPartner.download(report_document);

You may also include an options object as a 2nd parameter to the .download() function, i.e. to enable a json result or to additionally save the report to a file. It supports four optional properties:

The following call will download the report, transform it to json and save it to disk:

let report = await sellingPartner.download(report_document, {
  json:true,
  file:'<ABSOLUTE_FILE_PATH>/report.json'
});

Some reports may have an encoding other than UTF-8 and require special decoding with a different charset, i.e. the GET_MERCHANT_LISTINGS_ALL_DATA report is encoded as cp1252. Proper decoding is possible with passing in the optional charset property:

let report = await sellingPartner.download(report_document, {
 charset:'cp1252'
});

Encrypt and upload feeds

The .upload() function takes the feed upload details (url and encryption details) received from a createFeedDocument operation, the feed content and its content type to upload as input, encrypts the content and uploads it.

Start by creating a feed object with a contentType and the content either as a string or a file path to a document:

This will create an inventory feed (POST_INVENTORY_AVAILABILITY_DATA) that will update the quantity of a given SKU to 10:

let feed = {
  content:`<?xml version="1.0" encoding="utf-8"?>
    <AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amzn-envelope.xsd">
      <Header>
        <DocumentVersion>1.02</DocumentVersion>
        <MerchantIdentifier>YOUR_MERCHANT_IDENTIFIER</MerchantIdentifier>
      </Header>
      <MessageType>Inventory</MessageType>
      <Message>
        <MessageID>1</MessageID>
        <Inventory>
          <SKU>YOUR_SKU</SKU>
          <Quantity>10</Quantity>
        </Inventory>
      </Message>
    </AmazonEnvelope>`,
  contentType:'text/xml; charset=utf-8'
};

Before you can upload the feed you need to retrieve the feed upload details from a createFeedDocument operation:

let feed_upload_details = await sellingPartner.callAPI({
  operation:'createFeedDocument',
  endpoint:'feeds',
  body:{
    contentType:feed.contentType
  }
});

Call the .upload() function to encrypt and upload the content of the feed:

let res = await sellingPartner.upload(feed_upload_details, feed);

After uploading the feed you have to trigger the processing of the feed by calling the createFeed operation with the necessary params (marketplaceIds, feedType and inputFeedDocumentId):

let feed_creation_infos = await sellingPartner.callAPI({
  operation:'createFeed',
  endpoint:'feeds',
  body:{
    marketplaceIds:['A1PA6795UKMFR9'],
    feedType:'POST_INVENTORY_AVAILABILITY_DATA',
    inputFeedDocumentId:feed_upload_details.feedDocumentId // retrieve the feedDocumentId from the "createFeedDocument" operation
  }
});

NOTE: Although uploading and creating the feed was successful it doesn't mean that the processing of the feed itself was also successful. You can check the result of the feed once it has been processed by downloading the processing result with the .download() function quite similar as how to download reports. Use the feedId returned by the createFeed operation and call the getFeed operation, which will include a resultFeedDocumentId if feed processing is already done. The resultFeedDocumentId can be used with a getFeedDocument operation that will return the feed download details needed for the feed result download.

TypeScript Support

All TypeScript related information can be found in lib/typings. Currently types are not yet defined for all operations and/or params, so feel free to add new types following the readme. You are also welcome to create a pull request.

Sandbox mode

You can easily enable sandbox mode by setting use_sandbox in the constructor config options to true. When using the sandbox you have to make sure to use the correct request parameters for the operation you want to test. You can find these inside the api models definitions by searching the corresponding json file for x-amazon-spds-sandbox-behaviors. For example, this will test the listCatalogItems operation in sandbox mode:

let res = await sellingPartner.callAPI({
  operation:'listCatalogItems',
  endpoint:'catalogItems',
  query:{
    MarketplaceId:'TEST_CASE_200',
    SellerSKU:'SKU_200'
  }
});

Known Issues

Since the Selling Partner API is still pretty new, not all API paths and endpoints have been tested for full functionality. If you find any calls not working please open up a new issue.

Some operations don't respect the correct restore rate yet, meaning they restore a lot slower than the default restore rate.

Some endpoints might have issues with special charsets like UTF-8. I.e. the finances operations return invalid UTF-8 encodings for all data prior to May 2020 resulting in JSON parse errors.

Seller Support

If you are selling on the european market we might be able to support you with everything else that can't be done with the API, i.e. a detailed sales dashboard, review management, product sourcing or sales and revenue estimations for products. Feel free to visit us at https://amz.tools.