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Looks like you could use

<https://www.pulumi.com/docs/reference/pkg/aws/acm/certificate/#importing-an-existing-certificate>

to import the cert and then i think

<https://www.pulumi.com/docs/reference/pkg/aws/apigateway/clientcertificate/#look-up>

To associate it to the gateway.

i'm just trying to find relevant methods while following

<https://aws.amazon.com/about-aws/whats-new/2017/03/amazon-api-gateway-integrates-with-aws-certificate-manager-acm/>

so could be very wrong here

lastly if your using crosswalk then this seems to walk through it

<https://www.pulumi.com/docs/guides/crosswalk/aws/api-gateway/#configuring-aws-api-gateway-custom-domains-and-ssl-using-route53-and-acm>

in my case its not route53 it is cloudflare