Step 1: Go to Certificate Manager, Click on Request a certificate
Step 2: Select Request a public certificate and click on Request a certificate
Step 3: Enter the domain name say api.donotstoplearning.com and click Next
Step 4: Choose DNS Validation and click Next
Step 5: Click Create record in Route 53 button after the review step
Step 6: Click continue
The public certificate should be available almost immediately.