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Signature Algorithm

  1. From the request parameters, exclude sign and all parameters with null or empty values. Then, sort the remaining parameters lexicographically.
Lexicographical Definition: In English dictionaries, words are arranged in order of the first letter (i.e., in the sequence a, b, c… z). If the first letter is the same, compare the second, third, and subsequent letters. If by the end the two words are of different lengths (e.g., “sigh” and “sight”), place the shorter one first.
  1. After sorting, concatenate the parameters in the format “key1value1key2value2...”.
  2. Prepend the API Key to the string obtained from step 2.
  3. Convert the string from step 3 into an md5 hash, in lowercase, to get the sign. Include this sign in the request parameters.

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Signature Example

step 1 Assuming the API Key is:
The request parameters excluding the ‘sign’ field are:
step 2 Sort and combine the non-empty key-value pairs in dictionary order:
step 3 Concatenate the API key to the string from the previous step:
step 4 Calculate the MD5 hash of the resulting string. The computed ‘sign’ value is:
final step Add the computed ‘sign’ value to the original request parameters: