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Amazon Seller API Postman: Best Practices and Tips for Successful Integration


How to Use Postman for Amazon Seller API




Postman is a popular tool for testing and developing APIs. It allows you to create, send, and manage HTTP requests in a user-friendly interface. You can also use Postman to import, document, mock, monitor, and test APIs.


If you are a developer or a seller who wants to use the Amazon Seller API (SP-API), you can use Postman to simplify and streamline your workflow. The SP-API is a suite of RESTful APIs that enable you to programmatically access various features and functions of the Amazon marketplace. You can use the SP-API to manage your inventory, orders, reports, feeds, notifications, authorizations, and more.




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In this article, you will learn how to use Postman for SP-API. You will learn how to set up Postman with the required credentials and tokens, how to make calls to SP-API endpoints, and how to test and debug SP-API responses. By the end of this article, you will be able to use Postman as a powerful tool for working with SP-API.


Prerequisites




Before you can use Postman for SP-API, you need to have some prerequisites. These include:


  • Credentials: You need an AWS access key pair (access key ID and secret access key) and a Login with Amazon (LWA) client ID and client secret. You get these credentials when you register your application on the Amazon Developer Portal. You also need an LWA refresh token, which you get from Seller Central after authorizing your application.



  • Tokens: You need an LWA access token, which authorizes your application to take certain actions on behalf of a selling partner. You can generate an LWA access token using Postman. You may also need a Restricted Data Token (RDT), which is required for calling restricted operations that return personally identifiable information (PII). You can get an RDT using the Tokens API.



  • Endpoint and Region: You need to know the SP-API endpoint and AWS region that correspond to the marketplace where you want to make requests. You can find the list of SP-API endpoints and regions in the .



Setting Up Postman for Amazon Seller API




Once you have the prerequisites, you can set up Postman for SP-API. Here are the steps:


Importing SP-API models into Postman




The first step is to import the SP-API models into Postman. The SP-API models are JSON files that describe the structure and parameters of each SP-API operation. You can download the SP-API models from the . To import them into Postman, follow these steps:</ - Open Postman and click on the Import button at the top left corner. - Select the File tab and drag and drop the SP-API models folder into the drop zone. - Click on Import to import the SP-API models as a collection in Postman. Generating LWA access token using Postman




The next step is to generate an LWA access token using Postman. The LWA access token is a short-lived token that expires after one hour. You need to refresh it periodically using your LWA refresh token. To generate an LWA access token using Postman, follow these steps:


- In Postman, select the SP-API collection and expand the Authorization folder. - Select the Get LWA Access Token request and open it in a new tab. - In the Params tab, enter your LWA client ID, client secret, and refresh token in the corresponding fields. - Click on Send to send the request and get the response. - In the response body, copy the value of the access_token field and save it somewhere. You will need it later for signing your requests. Requesting temporary credentials from AWS Security Token Service using Postman




The next step is to request temporary credentials from AWS Security Token Service (STS) using Postman. The temporary credentials are valid for six hours and consist of an AWS access key ID, a secret access key, and a session token. You need these credentials to sign your requests with AWS Signature Version 4. To request temporary credentials from AWS STS using Postman, follow these steps:


- In Postman, select the SP-API collection and expand the Authorization folder. - Select the Get Temporary Credentials request and open it in a new tab. - In the Headers tab, enter your AWS access key ID and secret access key in the corresponding fields. - In the Body tab, enter your LWA access token in the x-amz-access-token field. - Click on Send to send the request and get the response. - In the response body, copy the values of the AccessKeyId, SecretAccessKey, and SessionToken fields and save them somewhere. You will need them later for signing your requests. Signing requests with AWS Signature Version 4 using Postman




The final step is to sign your requests with AWS Signature Version 4 using Postman. This is a process that adds authentication information to your requests, such as a timestamp, a signature, and a scope. You need to sign your requests with AWS Signature Version 4 to ensure that they are authorized and secure. To sign your requests with AWS Signature Version 4 using Postman, follow these steps:


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- In Postman, select any SP-API request that you want to make and open it in a new tab. - In the Authorization tab, select AWS Signature from the Type dropdown menu. - Enter your temporary credentials (access key ID, secret access key, and session token) in the corresponding fields. - Enter your AWS region and service name (sellingpartnerapi) in the corresponding fields. - Click on Update Request to sign your request with AWS Signature Version 4. Making Calls to Amazon Seller API Endpoints using Postman




Now that you have set up Postman for SP-API, you can start making calls to SP-API endpoints using Postman. Here are some tips and examples:


Choosing the right endpoint and region for your request




Depending on which marketplace you want to make requests for, you need to choose the right endpoint and region for your request. For example, if you want to make requests for the US marketplace, you need to use as your endpoint and us-east-1 as your region. You can find the list of SP-API endpoints and regions in the .


To choose the right endpoint and region for your request in Postman, follow these steps:


- In Postman, select any SP-API request that you want to make and open it in a new tab. - In the URL field, replace endpoint with the endpoint that corresponds to your marketplace. For example, - In the Authorization tab, under AWS Signature, replace region with the region that corresponds to your marketplace. For example, us-east-1 Adding query parameters and request body to your request




Some SP-API operations require you to add query parameters and/or request body to your request. Query parameters are key-value pairs that modify the behavior of the operation, such as filters, sort orders, or page sizes. Request body is a JSON object that contains the data that you want to send to the operation, such as input parameters, identifiers, or content.


To add query parameters and request body to your request in Postman, follow these steps:


- In Postman, select any SP-API request that you want to make and open it in a new tab. - In the Params tab, add any query parameters that are required or optional for the operation


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