gistfile1.txt

120920210225150310/v2/subscription/customers{
	"name": "test",
	"surname": "test",
	"identityNumber": "11111111111",
	"email": "testdenemesiismet@gmail.com",
	"gsmNumber": "+905346118505",
	"billingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"shippingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"locale": "tr",
	"conversationId": "1234567890"
}

hmacsha256.py

import hmac
import hashlib

SECRET_KEY = 892374928347928347283473

message = ''
signature = hmac.new(
    str(SECRET_KEY),
    msg=message,
    digestmod=hashlib.sha256
).hexdigest().upper()

print signature

iyzico.txt

STEP 1:
Headers;
    - "Accept": "application/json",
    - "x-iyzi-client-version": "iyzipay-dotnet-2.1.39",
    - "x-conversation-id": "1234567890"

STEP 2:
Random Key: "120920210225150310"

STEP 3:
UriPath: "/v2/subscription/customers"

STEP 4:
Payload: (payload = uripath + json)

/v2/subscription/customers{
	"name": "test",
	"surname": "test",
	"identityNumber": "11111111111",
	"email": "testdenemesiismet@gmail.com",
	"gsmNumber": "+905346118505",
	"billingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"shippingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"locale": "tr",
	"conversationId": "1234567890"
}

STEP 5:
dataToEncrypt: (dataToEncrypt = randomKey + payload)

120920210225150310/v2/subscription/customers{
	"name": "test",
	"surname": "test",
	"identityNumber": "11111111111",
	"email": "testdenemesiismet@gmail.com",
	"gsmNumber": "+905346118505",
	"billingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"shippingAddress": {
		"address": "Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1",
		"zipCode": "34742",
		"contactName": "test test",
		"city": "Istanbul",
		"country": "Turkey"
	},
	"locale": "tr",
	"conversationId": "1234567890"
}

STEP 6: Generate Hash
GenerateHash(apiKey, secretKey, randomKey, dataToEncrypt)
apiKey = "sandbox-afXhZPW0MQlE4dCUUlHcEopnMBgXnAZI"
secretKey = "sandbox-wbwpzKIiplZxI3hh5ALI4FJyAcZKL6kq"

Hash = "YXBpS2V5OnNhbmRib3gtYWZYaFpQVzBNUWxFNGRDVVVsSGNFb3BuTUJnWG5BWkkmcmFuZG9tS2V5OjEyMDkyMDIxMDIyNTE1MDMxMCZzaWduYXR1cmU6YWMyMGJiZTAxMDY2NjU3YmVmNTJlODk3ODM2MGQ0ODhjMDBlOGZjZGU1MDliY2UyZGM4OGMzNzc0NDA1M2FkZg=="

STEP 7:
AuthorizationHeader = "IYZWSv2 " + hash