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A SAM or CloudFormation template, checked against my serverless research: memory per function, Step Functions that are really a straight line, EventBridge rules with one consumer, and Provisioned Concurrency sizing.

Template (YAML or JSON)

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Globals:
  Function:
    Runtime: nodejs22.x
    MemorySize: 1024

Resources:
  ValidateOrder:
    Type: AWS::Serverless::Function
    Metadata: { Workload: cpu }
    Properties:
      Handler: validate.handler
      MemorySize: 256

ChargeCard:
    Type: AWS::Serverless::Function
    Metadata: { Workload: io }
    Properties:
      Handler: charge.handler
      ProvisionedConcurrencyConfig:
        ProvisionedConcurrentExecutions: 10

NotifyCustomer:
    Type: AWS::Serverless::Function
    Metadata: { Workload: io }
    Properties:
      Handler: notify.handler
      MemorySize: 128
      Events:
        OrderPlaced:
          Type: EventBridgeRule
          Properties:
            Pattern: { source: [shop.orders], detail-type: [OrderPlaced] }

Checkout:
    Type: AWS::Serverless::StateMachine
    Properties:
      Definition:
        StartAt: Validate
        States:
          Validate: { Type: Task, Resource: !GetAtt ValidateOrder.Arn, Next: Charge }
          Charge: { Type: Task, Resource: !GetAtt ChargeCard.Arn, Next: Notify }
          Notify: { Type: Task, Resource: !GetAtt NotifyCustomer.Arn, End: true }

Tip: add Metadata: { Workload: cpu } or io to a function to check its memory.

Findings

The rules come from the decision framework. To estimate latency and cost for a whole workflow, use the architecture review.