I have converted it to wei
{“network”:“testnet”,“tokenAddress”:“0x447e265c12b0d8456f49676bbeeef8ee0e1a905c”,“tokenId”:4,“tokenType”:“ERC721”,“userAddress”:“0x55b5f999f01afb57c1a12eedadfa60ac20568839”,“startAmount”:“300000000000000000”,“endAmount”:“290000000000000000”,“expirationTime”:1657303169,"_ApplicationId":“UTXuksOchvpn3kDAheA0Oz8Z6mIrvDoRe5V483NC”,"_ClientVersion":“js1.8.0”,"_InstallationId":“eb809d5c-1dab-403f-8303-60113e76dc63”,"_SessionToken":“r:35875a4fe040830442e849de6a5d717a”}
still postOrder is failing
request payload for post order is
{“message”:"{“types”:{“EIP712Domain”:[{“name”:“name”,“type”:“string”},{“name”:“version”,“type”:“string”},{“name”:“chainId”,“type”:“uint256”},{“name”:“verifyingContract”,“type”:“address”}],“Order”:[{“name”:“exchange”,“type”:“address”},{“name”:“maker”,“type”:“address”},{“name”:“taker”,“type”:“address”},{“name”:“makerRelayerFee”,“type”:“uint256”},{“name”:“takerRelayerFee”,“type”:“uint256”},{“name”:“makerProtocolFee”,“type”:“uint256”},{“name”:“takerProtocolFee”,“type”:“uint256”},{“name”:“feeRecipient”,“type”:“address”},{“name”:“feeMethod”,“type”:“uint8”},{“name”:“side”,“type”:“uint8”},{“name”:“saleKind”,“type”:“uint8”},{“name”:“target”,“type”:“address”},{“name”:“howToCall”,“type”:“uint8”},{“name”:“calldata”,“type”:“bytes”},{“name”:“replacementPattern”,“type”:“bytes”},{“name”:“staticTarget”,“type”:“address”},{“name”:“staticExtradata”,“type”:“bytes”},{“name”:“paymentToken”,“type”:“address”},{“name”:“basePrice”,“type”:“uint256”},{“name”:“extra”,“type”:“uint256”},{“name”:“listingTime”,“type”:“uint256”},{“name”:“expirationTime”,“type”:“uint256”},{“name”:“salt”,“type”:“uint256”},{“name”:“nonce”,“type”:“uint256”}]},“domain”:{“name”:“Wyvern Exchange Contract”,“version”:“2.3”,“chainId”:4,“verifyingContract”:“0xdd54d660178b28f6033a953b0e55073cfa7e3744”},“primaryType”:“Order”,“message”:{“maker”:“0x55b5f999f01afb57c1a12eedadfa60ac20568839”,“exchange”:“0xdd54d660178b28f6033a953b0e55073cfa7e3744”,“taker”:“0x0000000000000000000000000000000000000000”,“makerRelayerFee”:“250”,“takerRelayerFee”:“0”,“makerProtocolFee”:“0”,“takerProtocolFee”:“0”,“feeRecipient”:“0x5b3256965e7c3cf26e11fcaf296dfc8807c01073”,“feeMethod”:1,“side”:1,“saleKind”:1,“target”:“0x447e265c12b0d8456f49676bbeeef8ee0e1a905c”,“howToCall”:0,“calldata”:“0x23b872dd00000000000000000000000055b5f999f01afb57c1a12eedadfa60ac2056883900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004”,“replacementPattern”:“0x000000000000000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000000000000000000000000000000000000000000000000000”,“staticTarget”:“0x0000000000000000000000000000000000000000”,“staticExtradata”:“0x”,“paymentToken”:“0x0000000000000000000000000000000000000000”,“basePrice”:“300000000000000000000000000000000000”,“extra”:“10000000000000000000000000000000000”,“listingTime”:“1657299477”,“expirationTime”:“1657303169”,“salt”:“75881639447718648994744769966839365430216416546271016294301609840938728010806”,“nonce”:0}}",“orderSide”:1,“signature”:“0x5e6b128c604ef14d84ad4353647d8a2de1715c86935737b93dca698170fb81e24fed92bdbc66bdfe080087ca61f14a1c1a415b0f33ccc9fa643d5333eb72292f1c”,"_ApplicationId":“UTXuksOchvpn3kDAheA0Oz8Z6mIrvDoRe5V483NC”,"_ClientVersion":“js1.8.0”,"_InstallationId":“eb809d5c-1dab-403f-8303-60113e76dc63”,"_SessionToken":“r:35875a4fe040830442e849de6a5d717a”}
following is response
{“code”:141,“error”:{“status”:502,“headers”:{“x-powered-by”:“Express”,“access-control-allow-origin”:"*",“content-type”:“application/json; charset=utf-8”,“content-length”:“14”,“etag”:“W/“e-Tj8n9olBUMQK0x0qT7YAC46tguk””,“x-response-time”:“1307.651ms”,“date”:“Fri, 08 Jul 2022 16:59:47 GMT”,“connection”:“close”},“buffer”:{“type”:“Buffer”,“data”:[123,34,101,114,114,111,114,34,58,116,114,117,101,125]},“text”:"{“error”:true}",“data”:{“error”:true}}}