Handling STS Session Token in step function with multiple Lambda

Hi,

I have 3 lambda functions to process data from multiple accounts. Each Lambda is like a step in the overall process. It means Lambda 1 (Output) will be (input) to Lambda 2.

I have a step function that takes care of the sequence of the lambda function.

Here is the User case of one account.

• • Lambda 1 -- Read the list of all aws_accounts from the given parent aws_account and return JSON payload.
• • Lambda 2 -- Reads all IAM Roles information from each aws_account and returns JSON payload.
• • Lambda 3 -- Reads all IAM_Roles (in the loop) from previous steps and returns a list of policies in each IAM Role as JSON payload.

We have an IAM role in the parent account which has all the necessary access to read all data. I am assuming the IAM role to generate an access token to read data in each Lambda.

The same access token can be used in all functions in all 3 lambda. How can I pass an access token from one lambda to another lambda? OR How can I have a common class which will return a token and uses it in all 3 lambdas? I am trying to avoid generating access tokens 3 times for each lambda separately.

Please suggest. I am a newbie to Lambda functions.