In order to install your certificate in Oracle Wallet Manager, you need to:

• Import Root & Intermediate Certificate(s) into Oracle Wallet Manager (OWM).

  
  Note: This must be done BEFORE the end entity/domain certificate.

• Select Operations > Import Trusted Certificate from the Menu Bar.

• Choose the Select a file that contains the certificate option.

• Browse to and select the Root CA file.
  Note: In most cases this will be AddTrustExternalCARoot.crt.

• Click OK

• Repeat steps for the remaining Sectigo Intermediate certificate(s).

• Import the SSL (end entity/domain) certificate.

• Select Operations > Import User Certificate from the Menu Bar.

• Choose the Select a file that contains the certificate option.

• Browse to and select your certificate.
  Note: In most cases this will be yourDomain.crt.

• Click OK

• You will now find that the certificate node in the navigation pane changes from
  Certificate: [Requested] to Certificate:[Ready]. Now the wallet with a certificate is ready to use for SSL.

• Save the wallet.