ok, thanks David. i think i ma going to apply for the api onboarding and see what comes back. Most likely too overwhelming for me to integrate.
If it is your own site from scratch where you take care of the entire login flow, it will be easier to integrate. Since you are using WP and WP has its own login flow that you need to augment, you will need to understand how WP authenticate and how you can intercept or bypass the original login flow with an external IDP.
I have not done SingPass QR myself, but I have inspected the network behaviour of the existing sites that have integrated. You can activate the developer console and observe what happens when you login with your own SingPass and get an idea what is going on at the network side of things.
If you have done OAUTH/OIDC and JWT, most of the complexity is around there. Some effort required to make sure the signing/encryption/decryption is done properly.
They have a staging environment for you to trial all you like, and the documentation seems pretty detail, so just give it your best shot
