phone-users-{user Id}-calling plans

Number of APIs: 3

1. Assign calling plan to a user

POST {{baseUrl}}/phone/users/:userId/calling_plans

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2. Update user's calling plan

PUT {{baseUrl}}/phone/users/:userId/calling_plans

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3. Unassign user's calling plan

DELETE {{baseUrl}}/phone/users/:userId/calling_plans/:type

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