这是我的config

@bean
@ConditionalOnMissingBean
public WxPayService wxService() {
WxPayConfig payConfig = new WxPayConfig();
payConfig.setAppId(StringUtils.trimToNull(this.properties.getAppId()));//V3商户模式需要
payConfig.setMchId(StringUtils.trimToNull(this.properties.getMchId()));//V3商户模式需要
payConfig.setMchKey(StringUtils.trimToNull(this.properties.getMchKey()));
payConfig.setKeyPath(StringUtils.trimToNull(this.properties.getKeyPath()));
payConfig.setApiV3Key(StringUtils.trimToNull(this.properties.getApiV3Key()));//V3商户模式需要
payConfig.setCertSerialNo(StringUtils.trimToNull(this.properties.getCertSerialNo()));//V3商户模式需要
payConfig.setPrivateCertPath(StringUtils.trimToNull(this.properties.getPrivateCertPath()));//V3商户模式需要
payConfig.setPrivateKeyPath(StringUtils.trimToNull(this.properties.getPrivateKeyPath()));//V3商户模式需要
payConfig.setPublicKeyId(StringUtils.trimToNull(this.properties.getPublicKeyId()));//V3商户模式需要

payConfig.setFullPublicKeyModel(true);
payConfig.setStrictlyNeedWechatPaySerial(true);


WxPayService wxPayService = new WxPayServiceImpl();
wxPayService.setConfig(payConfig);
return wxPayService;

}