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Generate a string to be signed - open-api Demo

1、Sort the parameters in ascending order of their parameter names in lexicographic order

2、Traversing the sorted dictionary, splicing all parameters together in "keyvalue" format (non-null parameters)

3、Use MD5 to treat signature strings

For example:

api_key = 1234567

time = 12312312312137

secret_key = 789654


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