Checkout Sessionpost https://uat-api.wpay.com.au/wpay-npp-payto/merchant-gateway/merchants/{merchantId}/session/checkoutPath ParamsmerchantIdstringrequiredBody Paramsapplication/jsontext/jsonapplication/*+jsonmerchantReturnUrlstringrequiredlength ≥ 1buyerobjectrequiredbuyer objectinstrumentobjectrequiredinstrument objectpaymentobjectrequiredpayment objectHeadersx-request-idstringrequiredcontent-typestringenumDefaults to application/jsonapplication/*+jsonapplication/jsontext/jsonAllowed:application/*+jsonapplication/jsontext/jsonResponses 201Successful 400Bad Request 401Unauthorized 403Forbidden 500Internal Server ErrorCallbacksInstrument.Createdpost<MerchantWebhooksUrl>Instrument.Cancelledpost<MerchantWebhooksUrl>Instrument.Pausedpost<MerchantWebhooksUrl>Instrument.Resumedpost<MerchantWebhooksUrl>Instrument.Updatedpost<MerchantWebhooksUrl>Payment.Completedpost<MerchantWebhooksUrl>Payment.Rejectedpost<MerchantWebhooksUrl>Updated about 1 month ago