feat: added ability to remove attached proration from offering

src/endpoints/subscription-offerings.js

@@ -60,8 +60,8 @@ class SubscriptionOfferingsEndpoint extends CRUDExtend {
 
   AttachProrationPolicy(offeringId, body) {
     return this.request.send(`${this.endpoint}/${offeringId}/relationships/proration-policies`, 'PUT', {
-      ...body
-    })
+      data: body
+    }, undefined, undefined, false)
   }
 
 }

src/types/subscription-offerings.d.ts

@@ -162,5 +162,5 @@ export interface SubscriptionOfferingsEndpoint
 
   RemovePlan(offeringId: string, planId: string): Promise<void>
 
-  AttachProrationPolicy(offeringId: string, body: SubscriptionOfferingAttachProrationPolicyBody): Promise<Resource<SubscriptionOfferingAttachProrationPolicyBody>>
+  AttachProrationPolicy(offeringId: string, body: SubscriptionOfferingAttachProrationPolicyBody | null): Promise<Resource<SubscriptionOfferingAttachProrationPolicyBody>>
 }