Utilize Amazon API Gateway with REST API features to integrate with the Lambda function. Set up individual usage plans in API Gateway for each customer, incorporating tailored request quotas. Generate API keys from these usage plans for customer access.

Employ Amazon API Gateway with HTTP API capabilities to link with the Lambda function. Establish customer-specific usage plans in API Gateway, including customized request quotas. Implement route-level throttling within each usage plan and issue API keys for customer use.

Develop Lambda function aliases for each customer, setting concurrency limits that reflect their respective request quotas. Create Lambda function URLs for these aliases and distribute them to the appropriate customers.

Deploy an Application Load Balancer (ALB) within a VPC, targeting the Lambda function. Integrate an AWS WAF web ACL with the ALB. Configure rule-based throttling for each customer, aligning with their required request quotas.