chore: update getting started docs

README.md

@@ -13,8 +13,6 @@
 - A fully typed TypeScript and Node.js SDK package for Amazon Selling Partner API
 - Uses models from [API model's repo](https://github.com/amzn/selling-partner-api-models) to generate classes automatically
 - Picks up changes and releases daily when/if models have drifted
-- Based on Axios and uses [aws4-axios](https://github.com/jamesmbourne/aws4-axios) interceptor to automatically sign the requests
-- Can optionally assume roles via STS, and refresh STS credentials on schedule
 
 ## Download & Installation
 
@@ -41,58 +39,6 @@ the OAuth flow or by using a self-authorized set of credentials.
 
 ### Basic Usage
 
-#### Using Existing AWS Credentials
-
-This method is applicable if you want to assume the
-[Selling Partner API role](https://github.com/amzn/selling-partner-api-docs/blob/main/guides/en-US/developer-guide/SellingPartnerApiDeveloperGuide.md#step-4-create-an-iam-role)
-yourself, or you are using a static set of user credentials (not recommended).
-
-```ts
-import { SellersApiClient } from '@scaleleap/selling-partner-api-sdk'
-
-const stsClient = new STSClient({
-  // Static set of credentials that have the permission to assume the role above
-  credentials: {
-    accessKeyId: 'AKIAIOSFODNN7EXAMPLE',
-    secretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYzEXAMPLEKEY',
-  },
-})
-
-const { Credentials } = await stsClient.send(
-  new AssumeRoleCommand({
-    // This is the role you have set in your Selling Partner API application
-    RoleArn: 'arn:aws:iam::123456789012:role/your-SP-API-role-name',
-    RoleSessionName: 'selling-partner-api-axios',
-  }),
-)
-
-const client = new SellersApiClient({
-  accessToken: 'Atza|...',
-
-  // Or use `amazonMarketplaces.CA.sellingPartner.region.endpoint`
-  // from `@scaleleap/amazon-marketplaces` package
-  basePath: 'https://sellingpartnerapi-na.amazon.com',
-
-  // Or use `amazonMarketplaces.CA.sellingPartner.region.awsRegion`
-  // from `@scaleleap/amazon-marketplaces` package
-  region: 'us-east-1',
-
-  credentials: {
-    accessKeyId: Credentials?.AccessKeyId || '',
-    secretAccessKey: Credentials?.SecretAccessKey || '',
-    sessionToken: Credentials?.SessionToken || '',
-  }
-})
-
-const marketplaceParticipations = await client.getMarketplaceParticipations()
-```
-
-#### Letting `@scaleleap/selling-partner-api-sdk` to Assume the Role
-
-This package uses [aws4-axios](https://github.com/jamesmbourne/aws4-axios) under the hood, which
-has the capability to make the STS call and get the credentials for you, and refresh the
-temporary AWS credentials session.
-
 ```ts
 import { SellersApiClient } from '@scaleleap/selling-partner-api-sdk'
 
@@ -106,15 +52,6 @@ const client = new SellersApiClient({
   // Or use `amazonMarketplaces.CA.sellingPartner.region.awsRegion`
   // from `@scaleleap/amazon-marketplaces` package
   region: 'us-east-1',
-
-  // This is the role you have set in your Selling Partner API application
-  roleArn: 'arn:aws:iam::123456789012:role/your-SP-API-role-name',
-
-  // Static set of credentials that have the permission to assume the role above
-  credentials: {
-    accessKeyId: 'AKIAIOSFODNN7EXAMPLE',
-    secretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYzEXAMPLEKEY',
-  },
 })
 
 const marketplaceParticipations = await client.getMarketplaceParticipations()