Below is the API guide that I was sent. I have a userId and a secretKey. I was putting the transactionId and secretKey in a SHA-512 hash generator (together, right next to eachother, no spaces) to create the requestToken. I was using the Exmaple URL exactly, except with my userId, transactionId, and requestToken.
URI
https://orders.sample.com/WebServicesV2/
(Please Note: Parameters and the Web URI except for the domain name are case sensitive)
API access Token Request
Any request from the website will require a token. Tokens generated will be automatically
expire after a certain duration, say 24 hours. To generate a token web will make request using
userId, transactionId and a SHA-512 hash of transactionId plus a secret key.
URL
https://orders.samplename.com/WebServicesTest/GetRequestToken
Input Parameters
userId (required)
transactionId (required)
requestToken (required)
userId = {will be provided}
transactionId = any number that you generate, can be date and time for example
20140421120101. Next transactionId must be higher than the previous one
requestToken = SHA-512 hash of transactionId + secretKey
Example
https://orders.sample.com/WebServicesV2/GetRequestToken?userId=sample&transactionI
d=20190525120000&requestToken=E9F6BF297140B2A7C73B1B46E388C7D8ADFB730704
696DE7F67F2509D7D97AB92C7DD6F92956B666334BF5B0A3FD64C7145A4ECF435F8171
B181FC3D7C701548