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Get Allowance
Returns the token spend allowed by an address on behalf of the crypto holder.
Before making use of X Swap, you must approve the contract first to proceed with the token spend.
You could get the allowance and see whether you are willing to approve X Swap to execute swaps on your behalf via this API.
get
endpoint
/approval
Get the allowance of token
NOTE : The spender should be the contractAddress in the response of Get Quote.
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