Example 1: Pre-Request Script for Amazon SP API – Method POST
This example demonstrates how to generate Pre-Request Script for Amazon, the necessary AWS Signature Version 4 for a POST request.
Python Script
import time
import datetime, hashlib, hmac
import json
access_key='{{access_key}}' # Provide Values
secret_key='{{secret_key}}' # Provide Values
host = '{{host}}' # Provide Values
endpoint = '{{hostname}}' # Provide Values
canonical_uri = '{{canonical_uri}}' # Provide Values
body = {{body}} # Provide Values
##########################################################################################################################################################
request_parameters = json.dumps(body)
t = datetime.datetime.utcnow()
amzdate = t.strftime('%Y%m%dT%H%M%SZ')
datestamp = t.strftime('%Y%m%d')
method = 'POST'
service = 'execute-api'
region = 'us-east-1'
canonical_querystring = ''
canonical_headers = 'host:' + host + '\n' + 'x-amz-date:' + amzdate + '\n'
signed_headers = 'host;x-amz-date'
payload_hash = hashlib.sha256((request_parameters).encode('utf-8')).hexdigest()
canonical_request = method + '\n' + canonical_uri + '\n' + canonical_querystring + '\n' + canonical_headers + '\n' + signed_headers + '\n' + payload_hash
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = datestamp + '/' + region + '/'+ service + '/' + 'aws4_request'
string_to_sign = algorithm + '\n' + amzdate + '\n' + credential_scope + '\n' + hashlib.sha256(canonical_request.encode('utf-8')).hexdigest()
kDate = hmac.new(('AWS4' + secret_key).encode('utf-8'), datestamp.encode('utf-8'), hashlib.sha256).digest()
kRegion = hmac.new(kDate, region.encode('utf-8'), hashlib.sha256).digest()
kService = hmac.new(kRegion, service.encode('utf-8'), hashlib.sha256).digest()
kSigning = hmac.new(kService, 'aws4_request'.encode('utf-8'), hashlib.sha256).digest()
signing_key = kSigning
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
Example 2: Amazon SP API – Method POST (with Body)
This example demonstrates a POST request with a JSON body to create a report.
Python Script
import time
import datetime, hashlib, hmac
import json
access_key='XXXXXXXXXXXXXXXXXX'
secret_key='XXXXXXXXXXXXXXXXXX'
method = 'POST'
service = 'execute-api'
host = 'sellingpartnerapi-na.amazon.com'
region = 'us-east-1'
endpoint = 'https://sellingpartnerapi-na.amazon.com'
body = {
'reportType': 'GET_FLAT_FILE_ALL_ORDERS_DATA_BY_ORDER_DATE_GENERAL',
'dataStartTime': '{%yesterday%}T00:00:01',
'dataEndTime': '{%yesterday%}T23:59:59',
'marketplaceIds': ['XXXXXXXXXX']
}
request_parameters = json.dumps(body)
t = datetime.datetime.utcnow()
amzdate = t.strftime('%Y%m%dT%H%M%SZ')
datestamp = t.strftime('%Y%m%d')
canonical_uri = '/reports/2021-06-30/reports'
canonical_querystring = ''
canonical_headers = 'host:' + host + '\n' + 'x-amz-date:' + amzdate + '\n'
signed_headers = 'host;x-amz-date'
payload_hash = hashlib.sha256((request_parameters).encode('utf-8')).hexdigest()
canonical_request = method + '\n' + canonical_uri + '\n' + canonical_querystring + '\n' + canonical_headers + '\n' + signed_headers + '\n' + payload_hash
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = datestamp + '/' + region + '/'+ service + '/' + 'aws4_request'
string_to_sign = algorithm + '\n' + amzdate + '\n' + credential_scope + '\n' + hashlib.sha256(canonical_request.encode('utf-8')).hexdigest()
kDate = hmac.new(('AWS4' + secret_key).encode('utf-8'), datestamp.encode('utf-8'), hashlib.sha256).digest()
kRegion = hmac.new(kDate, region.encode('utf-8'), hashlib.sha256).digest()
kService = hmac.new(kRegion, service.encode('utf-8'), hashlib.sha256).digest()
kSigning = hmac.new(kService, 'aws4_request'.encode('utf-8'), hashlib.sha256).digest()
signing_key = kSigning
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
Example 3: Amazon SP API – Method GET
This example demonstrates a GET request with AWS Signature V4.
Python Script
import datetime, hashlib, hmac
host = '{{host}}' # Provide Values
endpoint = '{{hostname}}' # Provide Values
access_key = '{{access_key}}' # Provide Values
secret_key = '{{secret_key}}' # Provide Values
canonical_uri = '{{canonical_uri}}' # Provide Values
##########################################################################################################################################################
t = datetime.datetime.utcnow()
amzdate = t.strftime('%Y%m%dT%H%M%SZ')
datestamp = t.strftime('%Y%m%d')
method = 'GET'
service = 'execute-api'
region = 'us-east-1'
canonical_headers = 'host:' + host + '\n' + 'x-amz-date:' + amzdate + '\n'
signed_headers = 'host;x-amz-date'
payload_hash = hashlib.sha256(('').encode('utf-8')).hexdigest()
canonical_request = method + '\n' + canonical_uri + '\n' + canonical_headers + '\n' + signed_headers + '\n' + payload_hash
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = datestamp + '/' + region + '/' + service + '/' + 'aws4_request'
string_to_sign = algorithm + '\n' + amzdate + '\n' + credential_scope + '\n' + hashlib.sha256(canonical_request.encode('utf-8')).hexdigest()
kDate = hmac.new(('AWS4' + secret_key).encode('utf-8'), datestamp.encode('utf-8'), hashlib.sha256).digest()
kRegion = hmac.new(kDate, region.encode('utf-8'), hashlib.sha256).digest()
kService = hmac.new(kRegion, service.encode('utf-8'), hashlib.sha256).digest()
kSigning = hmac.new(kService, 'aws4_request'.encode('utf-8'), hashlib.sha256).digest()
signing_key = kSigning
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
