sha256 - Problems encoding Amazon Flexible Payments secret string in PHP -

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sha256 - Problems encoding Amazon Flexible Payments secret string in PHP -

i trying utilize amazon payment services, , require me this:

here finish signature can see added signature method:

$string_to_sign = "get\n authorize.payments-sandbox.amazon.com\n cobranded-ui/actions/start? signaturemethod=hmacsha256&signatureversion=2&callerkey=my_key&callerreference=yourcallerreference&paymentreason=donation&pipelinename=singleuse&returnurl=http%3a%2f%2fyourwebsite.com%2freturn.html&transactionamount=4.0";

and encrypt below.

$encoded_string_to_sign = urlencode(base64_encode(hash_hmac("sha256", $string_to_sign, 'my_secret_key')));

i that, error them saying:

caller input exception: next input(s) either invalid or absent:[signaturemethod]

any thought might going wrong here?

here entire code this: (the variables assigned values above)

<?php $string_to_sign = 'get authorize.payments-sandbox.amazon.com/cobranded-ui/actions/startsignaturemethod=hmacsha256&signatureversion=2&callerkey=akiajenbysjcjx2idwdq&callerreference=yourcallerreference&paymentreason=donation&pipelinename=singleuse&returnurl=http%3a%2f%2fproblemio.com&transactionamount=4.0'; $encoded_string_to_sign = urlencode(base64_encode(hash_hmac("sha256", $string_to_sign, 'my_secret_key'))); $amazon_request_sandbox = 'https://authorize.payments-sandbox.amazon.com/cobranded-ui/actions/start?signatureversion=2&returnurl='.$return_url.'&paymentreason='.$payment_reason.'&callerreference=yourcallerreference&callerkey='.$my_access_key_id.'&transactionamount=4.0&pipelinename=singleuse&signaturemethod=hmacsha256&signature='.$encoded_string_to_sign; //echo $amazon_request_sandbox; - utilize if want see resulting request , paste browser header('location: '.$amazon_request_sandbox); ?>

thanks!!

check if included &signaturemethod=hmacsha256 on request

this kind of errors has 3 basic natures:

missing keys/values typos on keys/values incorrect encoding or spaces on keys/values

hope helps!

regards

php sha256 amazon-fps

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