Pre-request script pra BoaCompra Postman - https://developers.boacompra.com/direct-checkout/#how-to-generate-the-authorization-header

boacompra-authorization-prerequest-script.js

var secret = pm.variables.get("secret")
var merchant_id = pm.variables.get("store_id")

var Header = require('postman-collection').Header

var requestMethod = pm.request.method



// console.log(contentMd5)

if(requestMethod == "POST"){
    var contentMd5 = CryptoJS.MD5(pm.request.body.raw).toString()
    var hashHmac = CryptoJS.HmacSHA256('/transactions' + contentMd5, secret).toString()    
}else{
    var hashHmac = CryptoJS.HmacSHA256('/transactions', secret).toString()
}


pm.request.headers.add(new Header('Authorization: ' + merchant_id + ':' + hashHmac))
pm.request.headers.add(new Header('Content-MD5: ' + contentMd5))