Multiple parameters in Automation Scripts REST

Hello,

I am currently testing PAYPLANS integration REST options. After reading this: https://stackideas.com/docs/payplans/administrators/automation/rest-api-requests and
https://stackideas.com/docs/payplans/administrators/legacy-documentation/using-tokens
I have prepared REST API in other application that is now capable to receive data from PAYPLANS.

Due to my surprise, automation scripts are passing only ONE variable. In addition, it seems that the variable HAS to be placed at the end of the link.

I have prepared parameters and values for "Subscription Being Activated" event as follows:

p_external_id=[[PLAN_PLAN_ID]]&p_name=[[PLAN_TITLE]]&p_price=[[PLAN_DETAILS_PRICE]]&p_currency=[[PLAN_DETAILS_CURRENCY]]&p_expiration_type=[[PLAN_DETAILS_EXPIRATIONTYPE]]&p_nr_of_recurrencies=[[PLAN_DETAILS_RECURRENCE_COUNT]]&u_email=[[USER_EMAIL]]&u_name=[[USER_USERNAME]]&u_provider=api&u_password=TestoweHaslo&s_external_id=[[SUBSCRIPTION_SUBSCRIPTION_ID]]&s_status=[[SUBSCRIPTION_STATUS]]&s_total=[[SUBSCRIPTION_TOTAL]]&s_expires_at=[[SUBSCRIPTION_EXPIRATION_DATE]]

When triggered - only "p_external_id=2&p_name" is passed to the other system.

Unfortunately, this is not sufficient for our integration.

Please verify this functionality - it seems like an error. I assume that this limitation is not created intentionally?

Thank you in advance.