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Filters the subscription data that is sent to the payment gateway.
Parameters:

$subscription_data (array) – Array of subscription data, including the following:

price (float) – Base initial price to be paid today (excluding signup fees).
recurring_price (float) – Recurring payment amount.
discount (float) – Total amount of discounts applied towards the payment. 
discount_code (string) – Discount code that was used during registration.
fee (float) – Total fee(s) applied towards the initial price.
length (int) – Numerical length of the subscription.
length_unit (string) – Length unit (i.e. “day”, “month”, “year”).
subscription_id (int) – ID of the subscription level they’re signing up for.
subscription_name (string) – Name of the subscription level they’re signing up for.
key (string) – RCP subscription key.
user_id (int) – ID of the WP user account that’s making the registration.
user_name (string) – Login name of the WP user account that’s making the registration.
email (string) – Email of the user that’s making the registration.
currency (string) – Currency code that’s being used for the registration (i.e. “USD”).
auto_renew (bool) – Whether or not auto-renew is enabled for this registration.
return_url (string) – URL to redirect to after a successful signup.
new_user (bool) – Whether or not a new user account was created for this registration.
trial_duration (int) – Numerical length of the trial (or 0 if none).
trial_duration_unit (string) – Trial unit (i.e. “day”, “month”, “year”).
trial_eligible (bool) – Whether or not the user is eligible to signup for a free trial (if not, they should be charged the subscription price immediately).
post_data (array) – Array of all data submitted through the registration form.