To create a Certificate Signing Request (CSR) for the Apple Wallet Pass API, you'll need to follow these steps:

Prepare your environment: Make sure you have access to a computer running macOS or Windows.

Open Keychain Access: On macOS, you can find the Keychain Access app in the Utilities folder within the Applications folder. On Windows, you can use OpenSSL or other similar tools to generate the CSR.

Generate a new certificate key pair:

• On macOS: Open Keychain Access, go to "Keychain Access" > "Certificate Assistant" > "Request a Certificate from a Certificate Authority."
• On Windows (with OpenSSL): Open a terminal or command prompt and run the following command to generate a private key: openssl genpkey -algorithm RSA -out private.key -aes256. You will be prompted to enter a passphrase for the private key.

Create the CSR:

• On macOS: In the "Certificate Assistant" window, enter your email address and common name (usually your name or the name of your organization). Optionally, you can fill in other information such as organizational unit, organization, and country. Choose the "Saved to disk" option and save the CSR file.
• On Windows (with OpenSSL): Run the following command to generate the CSR: openssl req -new -key private.key -out request.csr. You will be prompted to enter the details for the CSR, such as email address, common name, etc.

Save the CSR: Save the generated CSR file in a secure location on your computer.

The CSR you have generated can now be used to request a digital certificate from a certificate authority (CA) for your Apple Wallet Pass API. Provide the CSR to the CA to initiate the certificate issuance process.

It's worth noting that the specific steps may vary depending on your operating system and tools used. Please refer to the documentation or support resources provided by your operating system or the tools you're using for more detailed instructions.