Parcelfy app Shopify

We Pre-sell highly discounted items via our Shopify website. Because of the discounted pricing and our free local pickup options, we do not have the margin to offer free shipping. Our customers are only able to purchase from one Collection at a time due to the timing of products arriving (anywhere from 1-6 weeks lead time) from our vendors. We currently offer several local pickup options and shipping (billed once product arrives). We would like to use Parcelfy app and have the ability to offer our products with the following shipping / pickup options: -currently option of 8 different local pickup locations -option of paying for shipping up front, or -be billed once product comes in for shipping As we sell a variety of products, and weights and sizes vary greatly. - we utilize a 4 digit code + product number in each Collection. Example- 1501-101 could be a child bracelet, 1501-102 and adult bracelet. -Again, customers can only purchase from one Collection at a time. All items in one Collection have the same 4 digit code plus unique product number We have a large percentage of our customer base that prefers to be billed for shipping, but want to expand and offer prepaid shipping to attract more customers. The 4 digit Buy Code will allow for the flexibility to price shipping according to product size within each collection. Shipping / pickup options: Prepay shipping (will not be used on all Buys, must be able to exclude this option) local pickup- multiple locations be billed for shipping You will set up Parcelfy for a variety of products weights. Usually the products within a Collection will not vary greatly in size. example- clothing items that range from 5 ounces to 15 ounces. However, some buys will include small 3 ounce items and bulky 18 ounce items. Maybe on these we will only offer billed shipping? You will need to advise on this. About 75% of our product ships in multiple sizes of poly mailers. The balance ships in various sizes of boxes. We currently ship most of our product via USPS, utilizing first class, priority mail (weight and several flat rate boxes). Occasionally we utilize Fedex.