Apple Pay Integration Expert for JWT Generation and Certificate Handling (Google Cloud Functions)

I am looking for an experienced developer with expertise in Apple Pay integration, specifically for handling JWT generation and managing Apple Pay Merchant Identity Certificates. The job involves resolving issues related to: Apple Pay Merchant Identity Certificate: Assistance in importing the certificate into Keychain Access or securely handling the private key and certificate files (in PEM... format). JWT (JSON Web Token) Generation: Creating a Google Cloud Function to generate a signed JWT using RS256. Configuring the JWT header with the correct Key ID (kid) for Apple Pay. Ensuring that the JWT is correctly formatted for Apple Pay's requirements. Error Troubleshooting: Resolving certificate import errors (-25294) and ensuring proper handling of the private key and certificate to sign the JWT. Requirements: Experience with Apple Pay Merchant Identity Certificates and JWT signing. Familiarity with Google Cloud Functions (Node.js environment). Experience handling PEM format certificates and private keys. Ability to troubleshoot and resolve certificate import errors (Keychain Access, OpenSSL). Knowledge of Apple's Developer Portal and certificate management. Deliverables: A working Google Cloud Function that generates a valid JWT for Apple Pay. Correctly configured Apple Pay Merchant Identity Certificate and Key ID for JWT. Troubleshooting of any errors encountered (e.g., certificate import issues). Additional Information: I’ve attempted to handle the certificate using OpenSSL and Keychain Access but encountered an import error (-25294). I’m unable to retrieve the Key ID (kid) from the Apple Developer Portal and need help securing it. This function will be used in a Make.com integration that requires the JWT for Apple Pay Apply Job!