In this directory there are five files:

api_sandbox_braintreegateway_com.crt - api.sandbox.braintreegateway.com certificate
DigiCertEVRSACAG2.crt - Intermediate CA certifcate
DigiCertGlobalRootG2.crt - G2 Root CA certificate
DigiCertGlobalRootG2_CrossSigned.crt - Cross-signed CA certificate (signed by High Assurance EV Root CA)
DigiCertHighAssuranceEVRootCA.crt - High Assurance EV Root CA certificate

See https://www.digicert.com/kb/digicert-root-certificates.htm
