Retrieving enpoint partitionId

[den-rgb]

Hey all,
I'm trying to update my code from v1 to v2 and one of my functions needs to get a partition Id from a specified region, but when looking into the v2 equivalent I found I need to use either the aws.EndpointResolverWithOptions.ResolveEndpoint or the aws.EndpointResolverWithOptionsFunc.ResolveEndpoint which take in a service, region and an optional interface of options, but when I try to call it to retrieve the partition Id I get a missing parameter of

not enough arguments in call to aws.EndpointResolverWithOptions.ResolveEndpoint
	have (string, string)
	want ("github.com/aws/aws-sdk-go-v2/aws".EndpointResolverWithOptions, string, string, ...interface{})

I'm unsure as to how to fill in the necessary field, I have had a discussion telling me to create a custom endpoint resolver but I am unsure as to how to go about doing that any examples will help greatly thank you; This is the full function I'm trying to use:

func GetPartition() string {
	region, err := GetRegion(arguments.GetRegion())
	if err != nil || region == "" {
		return "aws"
	}

	e, err := aws.EndpointResolverWithOptions.ResolveEndpoint("s3", region)
	if err || e.PartitionID == "" {
		return "aws"
	}
	return e.PartitionID
}