4. Create the String

For the String creation the following headers (request-target) host digest date must be used.

For the header field name (request-target) generate the header field value by concatenating the lowercased HTTP verb, a space and the request path
For the remaining headers create the string by concatenating the lowercased header field name followed with a colon :, a space and the header field value

🚧
Notes

Leading and trailing optional whitespace in the header field value must be omitted

Make sure that the order of the headers in the HTTP request is the same used to create the String

Request path in the (request-target) must include the QUERY PARAMS

The format of the date header must be EEE, dd MMM yyyy HH:mm:ss O

If there are multiple instances of the same header field, all header field values associated with the header field must be concatenated, separated by a comma , and a space and be used in the order in which they will appear in the transmitted HTTP message

POST /wally-services/protocol/tests/signature HTTP/1.1
Host: staging.authservices.satispay.com
Date: Mon, 18 Mar 2019 15:10:24 +0000
Content-Type: application/json
Content-Length: 123
Digest: SHA-256=ZML76UQPYzw5yDTmhySnU1S8nmqGde/jhqOG5rpfVSI=
{
  "flow": "MATCH_CODE",
  "amount_unit": 100,
  "currency": "EUR"
}

(request-target): post /wally-services/protocol/tests/signature
host: staging.authservices.satispay.com
date: Mon, 18 Mar 2019 15:10:24 +0000
digest: SHA-256=ZML76UQPYzw5yDTmhySnU1S8nmqGde/jhqOG5rpfVSI=

Code sample 2/4

BODY="{\n  \"flow\": \"MATCH_CODE\",\n  \"amount_unit\": 100,\n  \"currency\": \"EUR\"\n}"

DIGEST="SHA-256="$(echo -e "$BODY\c" | openssl dgst -sha256 -binary | base64)

STRING="(request-target): post /wally-services/protocol/tests/signature\nhost: staging.authservices.satispay.com\ndate: Mon, 18 Mar 2019 15:10:24 +0000\ndigest: $DIGEST"

$body = "{
  \"flow\": \"MATCH_CODE\",
  \"amount_unit\": 100,
  \"currency\": \"EUR\"
}";

$digest = "SHA-256=".base64_encode(hash("sha256", $body, true));

$string = "(request-target): post /wally-services/protocol/tests/signature
host: staging.authservices.satispay.com
date: Mon, 18 Mar 2019 15:10:24 +0000
digest: $digest";

const crypto = require('crypto')

const body = `{
  "flow": "MATCH_CODE",
  "amount_unit": 100,
  "currency": "EUR"
}`

const digest = `SHA-256=`.concat(crypto.createHash('sha256').update(body).digest('base64'))

const string = `(request-target): post /wally-services/protocol/tests/signature
host: staging.authservices.satispay.com
date: Mon, 18 Mar 2019 15:10:24 +0000
digest: ${digest}`

🚧Notes

Code sample 2/4

🚧
Notes