Apple don’t offer repairs to iPad per-se. Instead, for devices that remain within hardware support, Apple offer an exchange service.
For qualifying devices, you may be offered a reconditioned iPad of the same model and specification. The cost of the exchange/repair is c.60% of the “as new” price of the iPad. If you have an active AppleCare+ insurance plan, the cost is reduced to a nominal excess/deductible fee.
If you have a very old model of iPad (iPad2, iPad3, iPad4, iPad mini1), you may find an “independent” repairer who may be able to actually replace the Lightning connector of the iPad. Be aware that repairs attempted outside of Apple’s Approved Service Provider network will invalidate any warranty or future support options from Apple - so be careful if you elect to pursue this route.
Dependent upon the age of your iPad, it may be considerably more cost effective to consider replacement of your iPad with a newer model. Of current models, even the entry level iPad8 considerably outperforms the majority of iPad models from only a few years ago.
I hope this information and insight proves to be helpful to you - if only in quantifying the probable cost of a “repair”.