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.
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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.
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:
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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:
- 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. For example, if you want to call the getOrders operation, you can add query parameters such as MarketplaceIds, CreatedAfter, OrderStatuses, and NextToken. - In the Body tab, select raw and JSON from the dropdown menus. Then, add any request body that is required or optional for the operation. For example, if you want to call the createFeedDocument operation, you can add a request body such as "contentType":"text/tab-separated-values; charset=UTF-8". Handling pagination and throttling using Postman
Some SP-API operations return paginated results, which means that they return only a subset of the total results at a time. To get the next page of results, you need to use the NextToken query parameter with the value returned in the previous response. You can also use the MaxResultsPerPage query parameter to specify the maximum number of results per page.
Some SP-API operations are also subject to throttling limits, which means that they have a maximum number of requests that can be made within a certain time period. If you exceed the throttling limit, you will receive an error response with a 429 status code and a Retry-After header. You need to wait for the specified number of seconds before retrying your request.
To handle pagination and throttling using Postman, follow these tips:
- In Postman, select any SP-API request that returns paginated results and open it in a new tab. - In the Params tab, add the NextToken query parameter with an empty value. This will allow you to enter the next token value later. - Click on Send to send the request and get the response. - In the response body, look for the nextToken field and copy its value. This is the token that you need to use for getting the next page of results. - In the Params tab, paste the next token value into the NextToken query parameter field. - Click on Send again to send the request and get the next page of results. - Repeat this process until you get all the results or until you reach the end of pagination (indicated by an empty or null nextToken value). - If you encounter a throttling error (status code 429), look for the Retry-After header in the response headers and note its value. This is the number of seconds that you need to wait before retrying your request. - Wait for the specified number of seconds and then click on Send again to retry your request. Testing and Debugging Amazon Seller API Responses using Postman
After making calls to SP-API endpoints using Postman, you may want to test and debug your responses using Postman. Here are some features and tools that Postman offers for testing and debugging:
Viewing and analyzing response status, headers, and body using Postman
Postman allows you to view and analyze various aspects of your response, such as status code, headers, and body. You can use these aspects to check if your response is successful or not, and if it contains the expected data or not.
To view and analyze response status, headers, and body using Postman, follow these steps:
- In Postman, select any SP-API request that you have made and open it in a new tab. - Click on Send to send the request and get the response. - In the response section below the request section, click on the Status tab to see the status code and message of your response. For example, 200 OK means that your request was successful, while 400 Bad Request means that your request was invalid or malformed. - Click on the Headers tab to see the headers of your response. Headers are key-value pairs that provide additional information about your response, such as content type, content length, date, etag, etc. - Click on the Body tab to see the body of your response. Body is a JSON object that contains the data returned by your request, such as output parameters, identifiers, content, errors, etc. You can also use different views (Pretty, Raw, Preview) and filters (JSONPath) to format and filter your response body. Using Postman tests and variables to automate and validate your responses
Postman allows you to use tests and variables to automate and validate your responses. Tests are snippets of JavaScript code that run after your request is sent and check for certain conditions in your response. Variables are placeholders that store and update values that can be used across your requests. You can use tests and variables to perform tasks such as verifying response status, extracting data, setting environment variables, etc.
To use Postman tests and variables to automate and validate your responses, follow these steps:
- In Postman, select any SP-API request that you have made and open it in a new tab. - Click on Send to send the request and get the response. - In the response section below the request section, click on the Test Results tab to see the results of the default tests that Postman runs for every request. You can also see the number of passed and failed tests in the status bar. - In the request section above the response section, click on the Tests tab to see and edit the test scripts for your request. You can use the snippets menu on the right to add predefined test snippets, or write your own custom test scripts using JavaScript and Postman APIs. - In the request section above the response section, click on the Variables tab to see and edit the variables for your request. You can use variables to store and update values that can be used across your requests, such as tokens, endpoints, regions, etc. You can also use the environments menu on the top right corner to create and switch between different sets of variables for different scenarios. - Click on Send again to send the request and run the tests and variables. Using Postman console and logs to troubleshoot errors and issues
Postman allows you to use console and logs to troubleshoot errors and issues in your requests and responses. Console is a tool that displays information such as requests, responses, test results, console messages, errors, warnings, etc. Logs are records of all the requests that you have made in Postman, along with their details and outcomes.
To use Postman console and logs to troubleshoot errors and issues, follow these steps:
- In Postman, click on the Console button at the bottom left corner to open the console window. - In the console window, you can see various information related to your requests and responses, such as headers, body, status, tests, console messages, errors, warnings, etc. You can also use filters (All, Info, Error) and search (Ctrl+F) to find specific information in the console. - In Postman, click on the History button at the left sidebar to open the history tab. - In the history tab, you can see a list of all the requests that you have made in Postman, along with their methods, URLs, status codes, timestamps, etc. You can also use filters (All Requests, Collections) and search (Ctrl+F) to find specific requests in the history. - To view more details about a request in the history tab, hover over it and click on the arrow icon. You can also click on it to open it in a new tab. Conclusion
In this article, you have learned how to use Postman for SP-API. You have learned how to set up Postman with the required credentials and tokens, how to make calls to SP-API endpoints using Postman , and how to test and debug SP-API responses using Postman. You have also learned some tips and best practices for using Postman for SP-API.
Postman is a powerful tool that can help you simplify and streamline your workflow with SP-API. You can use Postman to import, document, mock, monitor, and test SP-API. You can also use Postman to automate and validate your requests and responses, and troubleshoot errors and issues.
If you want to learn more about Postman and SP-API, you can check out the following resources:
: A comprehensive guide to learn how to use Postman for various purposes.
: A place where you can ask questions, share feedback, and get help from other Postman users and experts.
: A detailed guide to learn how to use SP-API for various scenarios.
: A complete reference of all the SP-API operations, models, parameters, and responses.
: A repository where you can find the SP-API models, code samples, tools, and issues.
We hope you found this article helpful and informative. If you have any feedback or suggestions, please let us know in the comments below. Thank you for reading!
FAQs
Here are some frequently asked questions about Postman and SP-API:
What is Postman?
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.
What is SP-API?
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 SP-API to manage your inventory, orders, reports, feeds, notifications, authorizations, and more.
How do I get started with Postman and SP-API?
To get started with Postman and SP-API, you need to have some prerequisites, such as credentials, tokens, endpoint, and region. You also need to set up Postman with the required credentials and tokens, import the SP-API models into Postman, generate an LWA access token using Postman, request temporary credentials from AWS STS using Postman, and sign your requests with AWS Signature Version 4 using Postman.
How do I make calls to SP-API endpoints using Postman?
To make calls to SP-API endpoints using Postman, you need to choose the right endpoint and region for your request, add query parameters and request body to your request if needed, handle pagination and throttling using Postman if applicable, and send your request using Postman.
How do I test and debug SP-API responses using Postman?
To test and debug SP-API responses using Postman, you need to view and analyze response status, headers, and body using Postman , use Postman tests and variables to automate and validate your responses using Postman, and use Postman console and logs to troubleshoot errors and issues using Postman. 44f88ac181
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