Domain Name	Found on	Still exists
app.api.sandbox.braintreegateway.com	Subdomain Center
cdn.api.sandbox.braintreegateway.com	Subdomain Center
dns1.api.sandbox.braintreegateway.com	Subdomain Center
gateway.api.sandbox.braintreegateway.com	Subdomain Center
images.api.sandbox.braintreegateway.com	Subdomain Center
video.api.sandbox.braintreegateway.com	Subdomain Center
www.api.sandbox.braintreegateway.com	Subdomain Center THC

Found 7 subdomains.

Results forapi.sandbox.braintreegateway.com