How to calculate signature V4 in R?

Hello,

I've been trying to make a HTTP GET call to my API Gateway API but cannot seem to generate the signature correctly - I keep getting the 'message:Forbidden' error.

I've been using the aws.signature package on Rstudio but no luck there as well and there are no R examples in the AWS docs. Has anyone done this before? I'd be keen to share my code as well if that helps.