from the external service the id is sent in the check-result-param.checkId parameter from $.id.
I need to insert it into the URL-pay parameter – in id=#checkId#.

I did everything right, but in the logs it shows empty. Why?

        <param name="pay-headers" param="Content-Type=application/json"/>
        <param name="pay-url" param=""/>
    <param name="pay-params" param="login=;password=;typeservice=#provider-service#;serviceid=#basic-serviceid#;id=#checkId#;summa=#realSum#;exchangerate=0;Fee=0;currency=0;typrequest=pay;account=#id1#;numdoc=#id#"/>
        <param name="pay-response-type" param="json"/>
        <param name="pay-result-path" param="$.status"/>
        <param name="pay-result-error-path" param="$.status"/>
        <param name="pay-result-param.id" param="$.id"/>
        <param name="pay-result-param.message" param="$.message"/>
        <param name="pay-method" param="GET"/>

pay-Response:
login=&password=&typeservice=popolnenie_card_external&serviceid=dd69b2d95e&id=&summa=1.00&exchangerate=0&Fee=0&currency=417&typrequest=pay&account=996550116158&numdoc=1189159

id=?? – why?