are u calling any private api, which required any token or API-Key, that you need to send in your header. or you need to whitelist your IP Address(env from where you are hitting) on server. then only you will get response.
i am using External API, its working for me. it you want to test it, do the following.
In execution: https://www.affirm.com/api/promos/v2/GIX13AE33EUODJHQ?amount=8999&field=ala&logo_color=blue&logo_type=logo&page_type=product&show_cta=true
In outbound Mapping , Sample response:
{
"promo": {
"html_ala": "Starting at <span class='affirm-ala-price'>$16</span>/mo with <span class='__affirm-logo __affirm-logo-blue'>Affirm</span>. <a class='affirm-modal-trigger'>Learn more</a>",
"config": {
"promo_prequal_enabled": true,
"promo_style": "prequal"
},
"ala": "Starting at $16/mo with Affirm. Learn more"
}
}
checked the parse button , then run. it will work.