diff --git a/waybackpy/availability_api.py b/waybackpy/availability_api.py
index 51ecf11..8d19211 100644
--- a/waybackpy/availability_api.py
+++ b/waybackpy/availability_api.py
@@ -1,30 +1,14 @@
-import re
 import time
 import requests
 from datetime import datetime
-from .__version__ import __version__
 from .utils import DEFAULT_USER_AGENT
 
 
-def full_url(endpoint, params):
-    if not params:
-        return endpoint.strip()
-
-    full_url = endpoint if endpoint.endswith("?") else (endpoint + "?")
-
-    for key, val in params.items():
-        key = "filter" if key.startswith("filter") else key
-        key = "collapse" if key.startswith("collapse") else key
-        amp = "" if full_url.endswith("?") else "&"
-        full_url = (
-            full_url
-            + amp
-            + "{key}={val}".format(key=key, val=requests.utils.quote(str(val)))
-        )
-    return full_url
-
-
 class WaybackMachineAvailabilityAPI:
+    """
+    Class that interfaces the availability API of the Wayback Machine.
+    """
+
     def __init__(self, url, user_agent=DEFAULT_USER_AGENT):
         self.url = str(url).strip().replace(" ", "%20")
         self.user_agent = user_agent
@@ -34,24 +18,50 @@ class WaybackMachineAvailabilityAPI:
         self.JSON = None
 
     def unix_timestamp_to_wayback_timestamp(self, unix_timestamp):
+        """
+        Converts Unix time to wayback Machine timestamp.
+        """
         return datetime.utcfromtimestamp(int(unix_timestamp)).strftime("%Y%m%d%H%M%S")
 
     def __repr__(self):
-        return str(self)  # self.__str__()
+        """
+        Same as string representation, just return the archive URL as a string.
+        """
+        return str(self)
 
     def __str__(self):
+        """
+        String representation of the class. If atleast one API call was successfully
+        made then return the archive URL as a string. Else returns None.
+        """
         if not self.JSON:
             return None
         return self.archive_url
 
     def json(self):
-        self.request_url = full_url(self.endpoint, self.payload)
-        self.response = requests.get(self.request_url, self.headers)
+        """
+        Makes the API call to the availability API can set the JSON response
+        to the JSON attribute of the instance and also returns the JSON attribute.
+        """
+        self.response = requests.get(
+            self.endpoint, params=self.payload, headers=self.headers
+        )
         self.JSON = self.response.json()
         return self.JSON
 
     def timestamp(self):
-        if not self.JSON["archived_snapshots"] or not self.JSON:
+        """
+        Converts the timestamp form the JSON response to datetime object.
+        If JSON attribute of the instance is None it implies that the either
+        the the last API call failed or one was never made.
+
+        If not JSON or if JSON but no timestamp in the JSON response then returns
+        the maximum value for datetime object that is possible.
+
+        If you get an URL as a response form the availability API it is guaranteed
+        that you can get the datetime object from the timestamp.
+        """
+        if not self.JSON or not self.JSON["archived_snapshots"]:
             return datetime.max
 
         return datetime.strptime(
@@ -60,6 +70,10 @@ class WaybackMachineAvailabilityAPI:
 
     @property
     def archive_url(self):
+        """
+        Reads the the JSON response data and tries to get the timestamp and returns
+        the timestamp if found else returns None.
+        """
         data = self.JSON
 
         if not data["archived_snapshots"]:
@@ -72,15 +86,29 @@ class WaybackMachineAvailabilityAPI:
         return archive_url
 
     def wayback_timestamp(self, **kwargs):
+        """
+        Prepends zero before the year, month, day, hour and minute so that they
+        are conformable with the YYYYMMDDhhmmss wayback machine timestamp format.
+        """
         return "".join(
             str(kwargs[key]).zfill(2)
             for key in ["year", "month", "day", "hour", "minute"]
         )
 
     def oldest(self):
+        """
+        Passing the year 1994 should return the oldest archive because
+        wayback machine was started in May, 1996 and there should be no archive
+        before the year 1994.
+        """
         return self.near(year=1994)
 
     def newest(self):
+        """
+        Passing the current UNIX time should be sufficient to get the newest
+        archive considering the API request-response time delay and also the
+        database lags on Wayback machine.
+        """
         return self.near(unix_timestamp=int(time.time()))
 
     def near(
@@ -92,6 +120,16 @@ class WaybackMachineAvailabilityAPI:
         minute=None,
         unix_timestamp=None,
     ):
+        """
+        The main method for this Class, oldest and newest methods are dependent on this
+        method.
+
+        It generates the timestamp based on the input either by calling the
+        unix_timestamp_to_wayback_timestamp or wayback_timestamp method with
+        appropriate arguments for their respective parameters.
+        Adds the timestamp to the payload dictionary.
+        And finally invoking the json method to make the API call then returns the instance.
+        """
         if unix_timestamp:
             timestamp = self.unix_timestamp_to_wayback_timestamp(unix_timestamp)
         else: